I like paypal, i find it easier and quicker but i do take postal orders and personal cheques, for those who don't have paypal, i was in that boat too once.
Delivery information
I try not to fob people off with postage, that's why i don't say £2.50 for a dvd because people who do that are just plain gready, i basically charge for the postage witch is usally 70p and around 50p for the envelope, that's for a dvd others like videos books etc will be heavier and may need wrapping by hand using bubble wrap and brown paper so i charge more.
Return policy
Only if the item is faulty or you are not happy with it but it has to be a good enough reason, nothing like i watched the film and thought it was rubbish so i want my money back, that'll be just daft.
Contact information
You'll have to win something first before i give that away.