I've only sold things on a casual basis, not as a full-time or even part-time eBay seller (same situation as you, more or less). I had no issues at all. I posted plenty of pictures, described my items as accurately as possible, and it went well. I haven't done it in a long time though so as far as tips go, mine may be out of date. Some are:
1) Start the asking price at something very enticing. If it's too high, people simply move on. If the item is worth a certain amount, the odds of bids getting close to that are very good. Yes, it's possible that it will sell for less than you'd like this way though....
2) You can set a 'reserve' price but again, don't set it too high or people don't bother.
3) Don't rip people off on the shipping charges. Some sellers sell their items for dirt-cheap prices but ship it "USPS Priority" for $4.99 or something around there but charge the buyer $19.99. Sadly, too many buyers don't factor in shipping charges. I'm pretty sure eBay has a shipping calculator and they get discounted rates from the common carriers. The shipping calculator will determine the rate based on where you are and where the winning bidder is. It also allows you to "pad" that amount (to cover buying a box, tape, etc, if necessary).
4) Package the items extremely well. Take pictures showing the packaging process before you tape the box shut. This is for "just in case" situations....
5) Restrict it to US and/or Canadian customers (this is for your protection).
6) Remember that nowadays, eBay/Paypal tend to side with the buyers by default, then you have to prove your case. Another "just in case" situation....