I have bought and sold upwards of 1,000 items on ebay over the course of more than a decade using 3 different accounts. That is about half and half, some items of realistic fixed value (eg computer components) and some that were very hard to place a value on (eg rare vinyl LPs).
FIRST - remember that ebay is totally focused on keeping buyers happy and providing them with bargains.
Anything that provides a benefit to the seller adds a fee. Ebay would love to have everything be a straight auction for 7 days or less and starting at $0.01
I think that "reserve" is totally stupid and confusing. If $25 is the least that you are willing to accept, start the bidding at $25. A $15 bid is just a frustrating waste of everybody's time. I also recommend that you do not mix auction and Buy-It-Now.
If you have reasonable knowledge of what an item will sell for, list it at a fixed price Buy-It-Now. Ebay will tap you for a higher fee, but the sale is transparent and you get your money immediately (if that is important to you). You will pay more if the sale runs longer than 7 days, if you feel certain that it will sell quickly, do not go "Until It Sells" until later, if necessary.
My advice is to list at the highest price that you believe you could possibly get, and reduce the price by 10% per week until you sell it. This top-down "reverse auction" guarantees a good price for the seller, where a conventional bottom-up auction gives buyers an opportunity for a bargain (which you, as the seller, do not want to happen).
As much as I hate ebay's rapacious fees, it is worth it to get a world-wide forum to look at my wares. Learn the Post Office flat rate box fees, especially for international. And international is a headache and nightmare, not least because of tracking issues.