I just sell things that I find cluttering my closets...clothes I never wear, bad judgement buys, things I really don't need for some reason or another.
Payment policy
I just accept paypal now.
Shipping information
It is much easier and cheaper in the long run to use Priority Mail. It gets there faster, you don't have to purchase shipping products, and it is just easier for me.
Return policy
generally most of the things I sell are not expensive enough to mess with the return postage. I describe things well, I don't sell anything that has a lot of wear, and I am honest. If something is misrepresented of course I would, but it's never been a problem.