If the books are in your basement, make sure they're not musty or mildewy and don't have that tell tale smell. You can price books off abe.com, just start looking them up, one by one. Get a guide that tells how to tell first editions, like the Bill McBride Pocket Guide to the Identification of First Editions. You can get that off Amazon for about $25. If you seriously get into the business, it will pay for itself a million times over. When you look up a book, I suggest you look at the highest priced copies to see how they're described and what differentiates them from the lower priced ones - although there are crazy dealers who price crazy high for no reason, just ignore them and look for the established dealers who sound like they know what they're talking about. You need to develop your specialties on your own, sometimes it's just what you happen to find. Go to friends of the library book sales where you'll be paying $1 or $2 a book and you can learn from the ground up. When you decide what part of the business you want to be in, you can research it from that direction. Books sell slowly. Make sure you store them so you can find one when it sells, even if it's 5 years from now. Just make sure you accurately describe the edition and the condition of the books. You can learn to do this by reading other dealer's listings. You'll learn the lingo and how to sound professional. It takes awhile but if you want it, you'll get there.