New to Blogging...Lol

Ok everyone i am going to give this bloggin thing a try...seems like alot of my friends do it so why not try it. Plus i have a lot of family who don't have facebook or myspace which by the way i am about to delete (myspace), so this would be a good way to keep up with everyone at once. i was wondering how do you customize your background???? please some help..lmao..well i am off too try this out wish me luck..lol