To get started, build up your overall feedback by purchasing a lot of small, inexpensive items. Things like pins, cards, and paper items that sellers can ship to you first class mail.
After you have 20 feedback (just as an example), start by listing items that aren't questionable or often replicated, so that you can build up the seller portion of your feedback. Ship quickly, pack items safely, and leave feedback for all of your buyers.
Once you've built up a bit of seller feedback showing that you're trustworthy and reliable, THEN start listing larger ticket items. Include as many photos as possible. Oversell the flaws, so that when your buyers receive their items, they're pleasantly surprised that the flaws aren't even that bad.

The reason I'd suggest selling smaller, cheaper items at first is that you'll typically get more interest in high-dollar items if you have established yourself as a reliable seller. People will be less leery of your offerings.
I started selling on eBay back in 1999, and my husband started his own selling account a couple of years ago and needed some help getting up and running.