If you want something "more concrete" you could loo at the tutorials in EsenthelEngineSDK\Tutorials\Source\Advanced\4 - Demos, Game Basics\Game Basics it have some "empty world" exemple with a character moving. For others questions, well i think you should wait a reply from Esenthel when he will have some free time.
In the editor you can make: world, gui, material, particles, mesh, destructible mesh (i probably forgot others thing, but you probably understand the point), everything else who is related to game mechanics should be made in C++.
I don't use the editor (right now), since i think like many others here the power of the engine is the core. Don't worry about english
, i'm myself not english, just try to make what you write readable and understandable. And i think others will want to help you if we see you put some efforts on that. But yes knowing english is for me, essential for programming.