Well I got the textures for the terrain, and I have some trees and stuff that I've completed and laid out in the object editor.
I see theres a property box for "is terrain cell" - so that's checked.
I build it as TERR0005, and have a tile named TERR0005 in the tiles folder.....
Deleted cache, since that seems to be the thing all the kids are doing...
Go into TE - now what?