To add onto what Theory said, you can also look up videos on youtube which is what I did.
You can also download lots of extra things like meshes, terrain textures and particles for your map by looking at the downloads in the "add ons and mods" section of the forum. I can't link. Right now as I'm on my IPad
You can also see if there are any public maps that would suit your roleplay that you could use, or temporarily use a public until you/someone fishes the official map.