Mark, I brush on Vallejo
Model Air for all my model painting. I don't possess an A.B.
You will probably receive differing responses I'm sure, but they work fine for me.
Tips?
Slightly thin the paint with tap water. I don't know about ratios. Practice on a spare bit of plastic.
I don't use these fancy thinners or retarders.
The first and possibly second coat of paint will look naff. Don't be tempted to thicken the paint. It will cover just fine. And unlike an A.B. the surface will be free of the dimples usually seen with paint applications using the hissing thing. (Tin hats on, everyone. Incoming!) And further more, the brush applied paint goes on the model, not into your lungs and atmosphere, spray Booth or not.....and yes, is better for your health. See 'Tin hats' above.
Use the correct brush for the specific application. Flat for big areas, fine for detail. That sort of logical approach.
I've done running brush painting commentary on some of my builds, but I'm blowed if I can remember which ones!
Again, you will probably get different opinions and advise than mine. Best try them all and see which suits you best.
Ron