Welcome Joe, there's a lot of experienced helpful members here. As they've said just ask.
I found it's best to avoid nailing or glueing down your track for a while, as this allows you to move things around a bit and find what works best for you, as you increase your rolling stock etc. Most layouts fall under point A to B linear type, or circular type layouts. As said before, a lot depends on your available space. Flexi-track allows for smoother (less sharp), more realistic curves, but involves cutting the track to length which is a little bit more work. Long coaches don't look very realistic on tight turns, as they can overhang the track and even uncouple or de-rail in some circumstances (at least on OO gauge track anyway).