How to prep already stained and varnished crown molding for drawing white? My wife and I are about to buy a house near crown...

My wife and I are about to buy a house near crown and chair guardrail in every room. Unfortunately, some of the rooms already enjoy white crown/chair/baseboard, but others have stained wood next to a varnish. We'd like to paint the colloquial colored rooms white to match the rest of the house and to blanch up the rooms. Suggestions on how to prep the crown/chair/baseboards? What type of paint to use?

Thanks!
Answers:    I would scuff up the stained molding using scotchbrite and then paint beside a good latex enamel. However I must include I am very out-of-date school and I have an idea that you are messing up painting the moldings! To me stained and varnished trim is much more classy than painted.
Use grease base satin or make notes on paint. Just clean the surface free of dust and buff it next to very fine #2000 steel wool if in that are rough surfaces that need smoothing out. Since you are fine art white, you should do the first coat (primer) with KILZ to be sure that the ominous stain colors never migrate up through the white paint. Once you primer with KILZ, you can paint beside a flat, satin or gloss.