All you need to know about paint:

1. The main difference between different brands of paint is the amount

of solids versus liquids in the paint. More solids = more expensive and

better paint. Given how cheap paint is, and how much labor it takes to

apply it, there is absolutely no excuse in buying anything other than

top-quality paint, especially when protecting something as valuable as

your house. Don't buy Glidden or other heavily advertised consumer crap.

Go to a paint store and buy their best line of interior latex. My

current favorite interior paint is Sherwin-Williams ProMar 200, but

Benjamin Moore and others have equivalent paints.

2. You need to prep old paint surfaces if they are at all glossy before

painting so the new paint will stick. This can be done by sanding or

chemically.

3. Unpainted surfaces, like bare wood and drywall, need to be sealed

with primer paint before the finish coat goes on. Again, don't skimp on

quality. Buy the best primer you can find.