I'd like to invite you to take a look at PennyBurners.com. We are a penny auction news blog and forum, and we have a growing list of Verified Penny Auction Sites, as well as a list for Unverified Sites In Good Standing, and Scam Penny Auction Sites.
A "Verified" status means that the site has passed a back-end review for the presence (or rather, lack of) of bots/shill accounts, they have submitted all of the proper paperwork for their company, and have been confirmed to have excellent customer service.
I would not recommend Swoopo, QuiBids, or BidCactus for a beginner, or at all, really. There are plenty of trusted, smaller penny auction sites, where you are sure to find a great deal and receive stellar customer service.
Please feel free to join us on our forums and ask any questions you may have. We have more than 750 users who would be happy to help you in any way they can =)
Hope to see you on PennyBurners!