How would you would put an in-game content creator;something similar to Little Big Planet and Mine Craft?
You know what your sin here is?
You just ask: “how do i make game.”
Google for: “voxel engine”. Minecraft is something like that.
Also check Fortninte, that game has nice construction system, however its closed beta so you need key for it from somebody that is in.
And there was some construction blueprint on marketplace.
But generally if you are serious about voxels do it in C++, blueprints are kind of limited for it. You need better arrays and data structures handling than blueprint can get you. Easiest way for doing it is making core functions in C++ exposing them as nodes to blueprint then experimenting.