Hi Alfeo,
If you go to Escrow.com you get exact info on how to ship and receive securely goods/money.
Bassically they act as a 3rd party. The buyer sends money to my wired bank account(which I find it a bit scary), then when the funds are checked and legitimized, Escrow allows you to ship the gear to the buyers address, providing a tracking number. Escrow checks the number and the shipping company, and if all correct, Escrow wires the money directly into your account. There is a fee for all this around $60.00USD plus shipping which you as aseller will get back from the buyer.
Check it out on their website.
Best,
dani