I've been reading through the forum and wanted to get some more tips

Basically we just bought our first home - yay! - and need to paint the whole inside of the house as it is currently a pale yellow colour in every room. We want to paint it white - the ceiling is white thankfully so don't need to do that. I'm thinking to paint it Antique White USA including the trims and around the doors and windows etc (which are currently a dark brown).
We've never painted before but we can't afford to get a painter in as we went over our budget just to buy the house. And it will be much easier to paint now when it is empty than a year down the track with furniture (and kids!) in there.
Does anyone have any tips for us on things to do / not do or even links to tips?
Thankyou!