For starter players, or skilled players who don't have enough tokens to get good decks, he can decide to look for Warlords who are recruiting Commanders to play their sub-accounts.
After you have found a Warlord, you then can discuss the terms with the Warlord, ie: How to split the earnings, What is the pay, Working requirements, Days off if possible, etc… After all the agreements are settled, the Warlord will hand you the sub-account login credentials, either as a QR Login Code, or Email & password. Then you can login into the game and start playing.
Remember, all the earnings inside the accounts belong to the Warlord. The Commander payment can only be done directly from the Warlord to your wallet, in the form of your choosing and agreements with the Warlord.