Will you accept Paypal payment? Sellers have a lot of responsibilities if you accept Paypal. Well worth visiting the Paypal forum in the eBay Communities section online to see some of the horror stories. The big ones are:

1) You must send it with online tracking, plus insurance for something like a PC. Postage is at buyer's cost in addition to their bid and eBay helps with a postage calculator for your bidders. No tracking = fraudulent buyer targets your auction, claims never received and since you can't provide an online tracking number showing delivery, Paypal claws back the $. You end up with no PC and no $. Ditto if it arrives "broken". So tracking and insurance are requirements for YOUR benefit, they're not options for the buyer. Note that the tracking needs to be visible ONLINE at a recognized shipper: sending images of postal receipts etc doesn't meet PP rules and there are numerous complaints that this sort of evidence is ignored.

2) Don't send it to the buyer's aunt/buddy in Tuscon etc etc. Online tracking has to show delivery to the payer's certified/verified address specified by Paypal. If they want another address, point them to the PP rule and ask them to get the new address verified in their account asap.

3) Pack it really well: no insurance if they decide your packing was inadequate.

Also be aware that auction terms saying it looks OK but absolving you from responsibility if it turns up broken or not working, are as nothing when a buyer complains.

4) No Paypal for pickups/meetup at Starbucks etc. Pickup = no tracking number -> See above. Cash only if it's not being posted.

All of this is covered ad infinitum in the forum...