A tripod is useful for shots that don't have to be closeup, but for those detail shots that are so necessary on handbags (for showing engraved hardware, tags, serial numbers, any flaws, etc.), the real key is lighting, lighting, lighting. Natural lighting is always best, but if you can't get reliable bright natural light on a regular basis you can invest in some inexpensive yet effective lighting sources.
I used to use a big "shop light" thing from Home Depot, believe it or not, and it was like twenty bucks. It's just unwieldy, so I got rid of it, and now have professional photo lights on stands. They were like $50 each, but for the number of items I sell, it was a great investment.
The other hint I have, that I see more and more sellers NOT doing these days, is to use a solid colored background. It's far less distracting than any sort of printed fabric--even beautiful fabric takes the eye away from the item being sold, and this is true of the camera's focus as well. If you try to photograph a bag or other item on a printed background the camera really isn't sure where to focus.
Last thing, experiment with different settings on your camera. Take the same picture from the same angle with the same lighting, and compare the differences in the final shot. I personally like to use the macro setting (it is symbolized by a little flower looking thing) for almost all shots, because it gives you a tight focus on the item and sort of blurs out the background a little bit.
One more thing and I swear this is it...LOL. I believe eBay has a photography board in their community forums, at least they used to when I used to post there years ago. It was a fantastic resource for me when I first started selling lo those many years ago.
Good luck!!