Since I am celebrating 10 years on eBay tonight, I think that I am highly
qualified to write on the subject.

1)  Be clear in your description - if it's used, say it; if it's got a flaw,
mention it; if you have special knowledge of the item, share it

2)  Charge reasonable shipping - $5 for handling is about as fair as larceny

3)  Congratulate your winner - thank them for their business and for
choosing YOU over the millions of other eBayers

4)  Acknowledge their payment - a quick e-mail letting them know you
received their payment will put them at ease and know that they aren't lost
amongst your many other buyers

5)  Send them a "your package is being shipped" e-mail with the day it's
being shipped, the method and how long they should expect for their package
to arrive

6)  Answer their questions - they took the time to ask; take the time to
answer - even if you think it's a dumb one, you'd be surprised how a polite &
informative answer can make you a long-time customer

7)  Package efficiently, but safely - don't throw a book in a manilla
envelope and expect it to arrive unharmed; recycle corrugated cardboard
boxes (saves you & you're doing some good for the earth)

8)  Return feedback - notice I say "return", the buyer has the last duty in
the transaction, contacting you if there is any problems/errors/omissions or
leaving positive feedback to let you know they were pleased.  I don't
necessarily mean return all feedback - there are times when I use the old
saying, "if you can't say something nice, don't say anything at all". But by
far, over the course of 10 years, I've left hundreds more feedback than was
returned and that stings.

9)  Handle disputes as though the customer is your mother - it takes a lot
of courage for a customer to contact you & complain - it's much easier for
them to just post negative/neutral feedback so do what you can to make the
situation better.  You'll be glad you did.  I've had many disputes over the
decade and I've won many customers over by being polite and going above &
beyond "my duty" as a seller.  The statement "as is" doesn't mean you get to
sell them something that is trashed.

10)  Combine shipping - give your customers a legitimate discount when
purchasing multiple items.  I see so many sellers saying they'll give a mere
$1.00 break on each add'l item when I know that 99.9% of the items can be
shipped together and the seller will now be making more on the item than if
they buyer only bought one item.  Combined shipping benefits the seller and
it should benefit the buyer, too.

Please remember to vote if this Guide has been helpful. :)

Happy eBaying!