I have been selling on eBay for 12 years as part of my regular income. eBay is constantly evolving and changing, sometimes for the better and sometimes for the worse. This past year they instituted some changes that were very annoying to those of us who are long time users, including forbidding buyers from paying by check or money order. I don't really see how it is any of their business how my buyers pay me.
They have also made it difficult for new sellers to get started. They seem to want to cater to the "big business" sellers who are listing 1,000 of the same item at a time, and the "little guy" is being inconvenienced.
My hope for 2009 is that some other auction service will step up and start to fill the void. It will be difficult because eBay is so entrenched, but they have P***d off enough sellers that the opening exists for a competitor.
I don't mean to discourage you from trying eBay - it is still the only game in town and, despite the economic downturn, still a valid way to earn extra money, or even make a living. But do follow the advice already given to learn as much as you can and make your listings stand out from the pack with excellent photos and thorough descriptions. You don't need to purchase any kind of extra materials - all the info you need is right on the site. Do make sure you have the right size box to ship the item in before you list it! Good luck to you and feel free to email me with any specific questions.