Someone needs to come up with a standard Pet Selling Guide I would but I havent sold enough to come up with any basic information to actually create a descent one.
If you have a request, it should probably go elsewhere (Neopets General Chat, Level 1 Chat, Chatbox, etc.)
Check out the 1st guide in my sig... It includes a really long and cool way to determine the value of ur pets (approximately)... It still needs testing until every1 agrees that its 100% right