Welcome back to modeling.
Your idea is a good one ("I will try paints and thinners from my LHS first, ...") that way you have a reliable source to draw from.
Keep in mind there is a boat load of different makers and types of paints out there and somebody is nearly always touting their latest find, as the perfect answer to a paint problem/color/type . But you can learn a lot sticking to one brand/type, until you're comfortable. Then branch out and experiment with others-
----'course in todays modeling world that may be just until next month