That really helps me. In learning any new program, I find it is necessary to attempt to understand the "logic" of the writer of the code. There are so many "behind the scene" activities that happen in TFP, I fear that I may mis-interpret. When I build a house, or imagine it, I generally start by thinking about the topography, then the building pad, foundation, etc. So much is done for me in this program that I fear getting in the way. And, if I started to far along the logic chain, how to add items that are earlier in the chain? For example--join the separately generated topo to the building plan.
I shall continue on, hopefully grasping the intentions, with many thanks to you for your help. It may be better to simply start over with the "quick start" as you pointed-out.