I'm getting ready to start selling stuff on eBay, so I've given it a little thought.
List the items separately. They will sell better than a lot of mismatched stuff.
Take the time to take good photographs and write good descriptions. It's the diference between decent interest and good interest.
Describe your items meticulously. If they have a defect, a scratch, a water stain, list it. It's your protection against claims the item was improperly described. On the same line, learn as much about each individual item as you can. The more you can honestly make your buyer know why he wants your item, the better you are.
Open a PayPal account. It makes it easy for people to pay you. As a seller, they discount your collection a bit, but it's a pretty decent rate, considering you can now accept Visa, MC etc. Always make it easy for people to send you money. In addition, they have some shipping and tracking tools that make your life easier.
Watch out for scams. There's a million of em. In general, don't ever give your password to anyone, even your sainted mother. Neither PayPal nor eBay will EVER send you an e-Mail asking for it. Never.
Let us know how you do.