recommendation for a paint noob?

So I bought some paints to do Knockout's rims. They turned out very well. So now I have the bug. One question. Do you guys have any tips for those tiny details. Do certain brushes/paints work better? is there a good technique? I've got a couple ideas swimming around in my head but I need to refine my skills. I'm practicing on some stuff that will never be displayed again. Thanks for any advice.