1- You being a newer member (with no feedback I assume) you'd be better off selling little stuff to get your feedback rating up. If you and I posted the same thing for sale, I'd get more bids and more money because of a 1000+ positive feedback rating, feedback means a lot to buyers as it shows a sellers dependability and honesty.
2- Post pictures of anything you sell, people like to see what they are bidding on. You'll notice items with pictures receive more bids on average than same items without. Plus it proves you actually own the item(s). Many e-bayers take pics with their e-bay name written on something with the item to prove legitimacy.
3- Give the best description you can of the item(s), including condition, age, etc. Try to include all info you can, this will cut down on meaningless e-mails asking common questions that could be avoided if all information is in the auction notes.
4- Include your shipping costs. Some sellers will put, "shipping will be determined at auctions end". This is a giant scam, as it allows the seller to make up whatever shipping charges they want after you already bought the item (and it will usually be more if they didn't get what they wanted out of the item). A lot of e-bayers avoid auctions like this no matter how good the deal looks. Easiest thing to do is weigh whatever it is you're selling and go to usps.com to calculate actual shipping costs.