I'm not expert but I've bought and sold.
If I were selling, I would have the buyer pay for actual shipping/handling.
I would accept Paypal (I have an account) as you get instant payment that way, Money order, or check but the check would have to clear before I mail out the item.
I usually ship priority mail and I insure it if they want for an additional $1.00. Priority mail is $3.40 I think and you get the box from the post office.
I give a full description and a picture if possible. I don't like buying items myself if I can't see a picture of it first. Tell them to ask any question BEFORE the auction is over.
Sometimes I like doing the "buy now" option. I like buying that way sometimes if the item is low enough.
If you really want a certain price for something and would very upset if it went for less than make sure to set a reserve price. Some buyers don't like reserve prices though so sometimes your taking a chance of it not selling. But the risk of no reserve price is that it will sell for the minimum bid amount.
If you have any more questions, feel free to ask.