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Look at this site for good advice on building a fire... www.nakedwhiz.com (don't try www.thenakedwhiz.com if you're worried about your browser history!
Anyway - under recipes read the Elder Ward North Carolina pulled pork recipe for tips to get you going. I followed the fire building method for most of my first cooks and had good success and got crazy and started dumping lump... first wake up to falling temps and ash clogging my fire grate and I appreciated Elder Ward's advice more.
Basically though clean it out, build the fire Elder Ward style and fill it up... it will be lots to last you.
Finally - welcome to the forum - stick around there is tons of great advice, good people and awesome cooks (food *orn) if you're into that sort of thing
If you're feeling adventurous for your first one - check out this post for a bit more complex way to season your pork butt - http://eggheadforum.com/discussion/1144753/pulled-pork-wow-from-diners-drive-ins-dives#latest