The game itself will guide you through what you need to do. I take it you're on your first playthrough? I would press resources and check out your updated resources. The fire should increase from 35 if you have 1 fire drake. I believe soon you'll want to build another egg farm. It's all intuitive AKA the fire section allows you to crate dragons, the eggs section allows you to build egg farms, the gold section allows you to higher minors, the mana section allows you to build wizard towers and upgrade your powers and the cult section allows you to upgrade your stats throughout each incarnation of the world.
Kind regards, Amin Abdullah.