Buddy i would suggest you to go through the manuals and YouTube basic videos and remember its a basic 3d engine not fully operational for complete game making from scratch as it uses python language and for real game making from scratch we use UNREAL ENGINE 4 as it gives the freedom to write own custom C++ functions, animations etc. Blender is basic use to MOD games i mean already made games you can edit the game characters etc under the game licence agreement. Once again check YouTube and manuals is the key to learn 3D engines. Good luck !