That’s my plan. No kids, no spouse, parents deceased. I’ll never be able to retire. On PSLF, but forgiveness not approved until 120th payment. Many are not being forgiven now. I take courses to stay in deferment. FedLoan bases payment on gross; not net. How does that make any sense?! After bills I can’t afford the payment. I have 3 grad degrees. Was supposed to be a psychologist. APA & NCE won’t accept my 15yo degrees for the national exam. So I teach at a CC. Over 180,000 in debt now and it grows monthly.
The best way to start selling on eBay is to actually start selling on eBay. Yes, there are some things to learn, but take your time, look at the eBay help files (and these tips) and just start selling. You will make some mistakes—we all do. But don’t get frustrated or give up. You will get better with experience. Also, selling will make you a better buyer. You will understand things from the seller’s point of view and learn other ways to spot bargains.
Another popular site to earn money doing gigs is Amazon's Mechanical Turk. You get paid a very small amount per gig (sometimes as low as $0.05) but you can do these tasks very quickly. For example, you could be asked to identify a picture or type certain text. When I was in college, I used to do these gigs in class and earn money while taking notes.
Search for freelance writing and editing gigs. The rates for these jobs vary: you may be paid by the word, be offered a flat rate for a project, or in some cases can be paid an hourly rate. You typically won't be able to retain copyright over your work or collect royalties, however. Even so, by doing freelance work you can build a portfolio and make valuable connections which may later pay off with more stable job opportunities.