I'd suggest you use the Make Map menu and export a 2048 x 2048 bitmap. Then with a program like Photoshop, place you fields and strat on a second layer, add the field numbers to yet a third layer. Print it out and building the terrain will be much easier and you already know PS. Covert it to jpg and post it here and email it to htc for review before you get too far, that'll avoid a lot of frustration. And htc won't accept imbedded jpegs, send it as a normal attachment but you probably already know that.
Place your 3 HQs first, they're the initial Zone masters like Raptor said.
When you run into trouble, exit and relaunch, place the first object, save and exit. The TE must have the various files on disk before it works right and they aren't always created until the first time you try to do something, i.e. roads.
After your sounds and skins we're expecting great things.