Just a few tips to help you make a better FS thread:
1. Package deals almost never have any success. People like to mix and match their own equipment, and generally have a piece to match up with whatever they are looking for. List each item for sale individually.
2. Give as much information about the product as you can. Include full model numbers, full specs, specify sizes and coil configurations for subs. The more people know about a product, the better they will feel about buying it.
3. Unless you've been here forever, people will not take your word on the condition of the items. Take a ton of pictures of your items, including a piece of paper with your screen name and today's date on them. Post them in the thread using one of many image hosting sites: photobucket, imageshack, tinypic(my favorite because you don't have to have an account and it's fairly quick).
4. Look around the forums and ebay before you post and make sure your prices are competitive. If people can get it cheaper somewhere else, they will.
5. List what kind of payment you take (Paypal, Money Order, Cash, Check, sea shells, whatever), your paypal address if you take it, and what kind of shipping method you tend to use (USPS, FedEx, UPS, DHL).
If I missed anything, there is a sticky at the top of the classifieds section that lays out how to make a good FS thread. Hope this helps