How do I open Awazon for the first time?

Short answer. Install Tor Browser from the official site, set the security level to Safest, copy a verified Awazon address from this help center, open it, and check the address against the one the login captcha prints before you type anything.

Step by step

First, install Tor Browser and set it to Safest. A normal browser cannot open an onion address, and Safest closes the biggest hole. Second, copy an address from the verified list, never type a fifty-six character string by hand. Third, when the login loads, hold the address in your bar against the one printed in the captcha. Match means genuine, mismatch means close the tab.

Then register

Pick a username you have never used elsewhere, generate a unique password, and store the recovery phrase the market issues on paper. That is the whole first visit.