Thanks for the reply.
Below is a photo of the layout (5' x 3'), sidings to be completed. Controllers will be by the fiddle yard, which will be hidden behind a back scene. Points 1 and 2 are electrofrog. I plan to use a shunter and other short wheel base loco on the inner loop. Points 3 and 4 are insulfrog, longer loco on the outer loop. All code 80, curves are settrack radius 1 and 2. So I should wire each of these separately, and each length of flextrack? Easy to see where my rails join, have to refit the sleepers.