First start with the stickies:
http://www.bansheehq.com/forums/index.php?showtopic=108636
http://www.bansheehq.com/forums/index.php?showtopic=105428
http://www.bansheehq.com/forums/index.php?showtopic=92579
http://www.bansheehq.com/forums/index.php?showtopic=98228
Paypal helps to receive your money fast, but there are fees included, I believe 4% now. Money Orders can be risky online, unless you know the person is reliable (since you don't have a lot of posts people would prefer to use money order because if you dont follow through with sending the item you can get in serious trouble with the law). To start a good reputation you need to ship out ASAP and give all your buyers a tracking number as soon as you get it. Give good Details and pictures on ALL your items being sold. UPS, FedEX, and USPS are all good places to ship items, some may be cheaper and/or have faster shipping times relating to weight,size, etc. Procedure is in STICKES, read them throughouly and have fun selling! I'd get posting to get that post count up!
Eric