The latter is very important. Since you will be shipping from Mexico, make sure your customers know that. A demand for payment of duty on the doorstep is not a happy result for a seller who hid his location.
In addition, be aware that you can only use Flat Rate shipping. Do not try to pretend that your rates are USPS rates.
Sellers from all over the world list on eBaydotCOM. Good luck in your endeavours!
