THE BASICS: write a Christmas/Holiday wish list. It can be any 10 wishes you'd like to have granted, no matter what they are. Possible or seemingly impossible. People look and grant the wishes if they can. It's not about "OMFG PRESENTS", it's about making someone else's holiday a little brighter by giving. Personally, I get more out of giving than receiving sometimes. It's just a good feeling to give.
STEP ONE
** Make a post in your journal. The post should contain your list of 10 holiday wishes. The wishes can be anything at all, from simple and fun ("I'd love a Snape/Hermione icon that's just for me") to medium ("I wish for _____ on DVD")