First, you're going to have to sand the piece down to get the old finish off.
Once you've gotten the finish off, you need to wipe it down with a damp cloth to get the sanded particles off.
Beyond that, if you're painting the piece instead of staining it, you do want to use a wood specific primer before putting the color on. Most hardware stores/paint shops would be able to steer you in the right direction as to what you'll need.
Liz
Proud mama to DS1: 2007
and DS2:2010
Life is too short to wear boring socks.