I have some standard language I include in all my auctions. A few things to include:
1. If you accept returns, make it very clear that you will not refund shipping and the buyer is responsible for return shipping costs.
2. I sell quite a bit of old computer gear, so I do try to post links to drivers and manuals but I do state that I don't offer refunds for incompatibilities and it is the buyer's responsibility to make sure it is compatible before buying.
3. I reserve the right to cancel sales to buyers with low, negative, or no feedback.
4. I expect payment within 48 hours of auction end.
5. I always make a note of exactly what is included and in some cases, what is NOT included.
I've bought and sold many things since the late 90s on eBay and have never been scammed. The only odd sale I add was a motherboard, CPU, and RAM combo to a guy and he emailed me saying it wouldn't work. I emailed him back saying it worked when I shipped it but I'd be happy to refund the purchase price minus shipping. He emailed back and said, in broken English, that it was working and he was glad I was so honest.