How can I make a BeamNG map?

I've always wanted to create a BeamNG map, but have no idea where to start, would love some tips and whatnot, to start making a map.

 

did you try looking at the wiki page?

 

I'll be sure to check it out

 

I used this tutorial, it is simple, and easy. I used it to make my map. https://www.beamng.com/threads/sunbay-island.69999/#post-1147850