Need feedback for selling my first game.

I just started making my first (indie) game using Unreal Engine 4, and i need some info about selling it because i am planning to release it in the future.

Questions i have:

**1.**How/do i need to credit epic games and unreal engine 4 in my game?

**2.**More information about the 5% cut Epic takes.

**3.**Can i sell my game on Steam?

**4.**More information about epic and unreal copyright and EULA agreement.

**5.**I like some suggestions/feedback from indie developers who sold their game.