Now that you have an Operator, you'll want to equip him with a weapon. You can do that by navigating over to the armory. Every Operator comes with a free common weapon mint.
Secondary market operators purchases may not have a free weapon mint
Then you'll want to press the select one of the 3 available gun packs 1x, 5x, 10x.
You'll receive a transaction from your Crypto Wallet to Mint the weapon(s).