Proper Prep process for painting?

I plan on buying some primer tomorrow, and curious what kind I should buy? And do I have to sand it down afterwards? I have never painted a model before so I don't know the process, could someone help me out?

Please read this.It is part of the board's FAQ.

Painting 101 (http://www.automotiveforums.com/vbulletin/t14192.html)

sorry, must have missed it when I was going over the FAQ. Thanks for the link :D