I'm back home now, Doc, thanks for thinking about me.
My favorite paints for figures are all Testors or owned by Testors. Model master is one of their lines but I prefer Pactra, if it's still to be found or, Floquil is my favorite, by far because of their choice of colors. I used Floquil back when I was into armor modeling.
I do have a technique for smoothing out those brush strokes that bother Wayne in that, after you get a coat on, if you see that it has some visible strokes in it, thin a bit of the same color with water to the point where it will puddle and apply it over the first coat working that puddle to coat the surface that you just painted. The natural adhesion of water will make the puddle want to stay on top of it's matching color as long as you don't go over board. When this puddle dries, you will find a smoother surface than the brushstroke ridden surface that you started with. It usually only takes one puddle wash to clear any strokes up for me but if not, do it again.
I don't wash my figures before hand but it wouldn't be a bad idea as there is some remaining mold release on the parts to contend with just like military model parts. Its usually not too bad to deal with as long as your primary color coat is thick enough. If it is too wet, it might bead when repelled by the mold release agent.
Sometimes I wonder if I shouldn't finely sand some of the parts before painting to increase adhesion of the paint but don't normally do that either.
Depending on what you are doing, at least a thin primer coat should be suggested just to make the real paintjob go smoother. On my white clones, If I am applying on graphics, I could live with the application of said graphics directly to the body but since some touchups are usually required, and the white touch-up paint rarely matches the white of the plastic, I usually paint the whole white part of the figure white prior to implementation of the graphics.
I do have an airbrush but haven't used it in years and do see where it could help in some areas. I just haven't gotten around to using it again yet.
Alot of times, I will paint my parts prior to reassembly. It just depends if I need to paint an area of the part that I can't reach after mounting, or, if said part would be easier to paint when it is mounted.