-That’s the sense behind those blueprint classes -> when you create a character bp, it should already contain the basic stuff like movement/mesh slot/… 
-The thing with the camera -> in the world properties you can choose the gamemode. In the gamemode you can add a camera + pawn blueprint which will create the camera (by default it’s set to spectator)
-Now to the learning part:
- https://wiki.unrealengine/Main_Page
- https://docs.unrealengine/latest/INT/Videos/index.html
- https://docs.unrealengine/latest/INT/
- As it’s normally nothing that ruins your learning process, I would recommend you to just open the engine + try to create a simple game. Then you will also know which kind of stuff is already made for you, because nearly all tutorials use such default settings
When you have problems with something (e.g that you dont know what exactly the engine already made), make sure to post it into the forum so that we can help you 