Hi Afrim.
Funny you just got an Iphone 6. I recently ordered one for my lady and I've been trying to assist her with setup and learning how to use vo.
The phone is layed out with a notification bar at the top of the screen that has info like your mobile network sygnal strength, temperature, time etc, then under that the home screen (or if your running an ap the screen for what your running), with all the links on to open different aps and parts of the iphone.
When you have more aps that will fit on one screen your home screen will have multiple pages, however you also have
the dock at the bottom, where there are links to three or four perminant aps that will always be there no matter what page of the home screen your on.
You can double tap and hold to drag things around the home screen to move them into the dock or ontop of each other to create folders, or double tap and hold then double tap again to delete, (creating folders is a bit of a pain but it's useful when you have many aps and games and such).
At a pinch you can operate vo in a basic mode with just two gestures, the flick left and right, and the double tap. Flicking is a little like tabbing on a windows machine, it takes you through all elements on a page (including paragraphs and headings), while double tap is your accept. You can also read the hole screen top to dottom with a two finger flick up, or from your current position with a two finger flick down.
The first ap I'd recommend is getting the looktell vo tutorial which will introduce all the gestures and a little about how to use the phone with a couple of games (it's description of the phone screen is a trifle out of date given the buttons have different names in Ios nine eg answer instead of accept call but it's still useful).
To do this find the ap store on your home screen and double tap, then flick to "search and double tap" you will then have a search box appear asking you for text so flick to the keyboard letters and enter looktell vo tutorial (you won't have to type all of this), then flick through the results and double tap on the "get" button then on "download"
The tutorial will take you through most of the necessary vo gestures including more advanced stuff like the roter, and has a few minigames to help you get used to the finger movements.
If you go into the settings menu, hit general, then accessibility, then voiceover, then find the link to "voiceover practice" you can try out vo gestures (I've tried this on my fiance who found it rather useful), this will let you perfect your technique and also tell you what gesture your doing and also what it does in terms of vo commands, which is useful on several lessons.
Then, don't forget siri. Enable siri in settings > general > siri. hold the home button down until you hear a bing, then release and say what you want, and siri will do it (you can also set hay siri to your voice so that you can use siri without holding the home button when the phone is plugged in). Siri can display help files, bring up screens on the phone, start aps and also do other useful things such as phoning different contacts or telling you the temperature, all in all very useful if your a lazy person like me .
The only funny thing to remember with the Iphone is that once you hit the home button to shut and ap and go back to the home screen, the ap isn't actually shut, it's still running in the background. Hitting the home button twice will bring up the ap switcher and you can flick left and right through various running aps and do a three finger flick up to close them (it's a good idea to do this ocasionally so you don't have male and ap store and settings and phone and goodness knows whatever else all running together taking up your phone's ram).
As to other useful aps, blindsquare is one I've got a lot of use out of. Basically, it tells you what shops, roads etc are around you and what sort of thing they are. So when walking along it'll say things like "your address is 22 whatever street, intersection with random road in 25 m at twelve O.clock, sandwich place, subway at 9 o.clock"
It's not exactly a satnav, it won't give you routes to places, but is great none the less.
As to getting used to the phone itself, I'd recommend personally finding some games to try out so you can explore vo and how it works and learn while you have fun with it. All of the choiceofgames and hosted games titles are available on Ios and will help with listening to and operating vo, what you will enjoy will depend upon your genre preference obviously, but I'd personally recommend fatehaven and samurai hyuga from the hosted games, and mecha ace and choiceof robots from the choiceofgames.
A dark room and the ensign are awesome rpg games, though start with a dark room. they've been optimized with vo in mind so are very! accessible, and addictive, though start with a dark room (particularly sinse the ensign is intendede to be a hard game).
King of dragon pass and Adventure to fate battle arena are great rpgs, but both have slightly more complex interfaces so should be handled with caution, similarly Silver sword is now accessible but has a lot oin terms of interface to play with and I confess I've personally not investigated it as yet.
There are some mmorpg type battle games if those are your thing such as turf wars (a mafia game), and solara, which has elements of building and battling and is imho rather a lot of fun (solara is a game I've enjoyed myself).
In audiogames, there are the games from somethinelse such as pappasangre 1 and 2, nightja and audio defense zombie arena. Apparently these are no longer supported but they do still work in Ios 9, (and some more sales might encourage the developers to support them more).
Ticonblu also have Ios versions of all of their games such as the inquisitor,space encounter, flarestar etc, which I have.
There are a lot of more simple games too, lost cities is a hugely fun and deceptively simple strategical card game, while the blindfold series has some nice entries if you want a qick game, from card and puzzle games to some rather cool audiogame versions of classic arcade games (their breakout is rather a lot of fun especially using the phone gyro).
Hth.
I'm afraid sinse I have found Itunes to be the spawn of satan, I don't use it at all, sinse even if I bought something on my phone I'm not prepared to just have it on there and no way to get it out of itunes (and itunes on a pc is pure evil), so I can't help with that sort of thing.
Any other questions let me know.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)