When starting your CFM, select settings tab on right and turn salary cap off, and you can also set trades to human especially if doing a 32 team control. Select your coach first so he is the commissioner and use Settings before advancing to next coach.
You don't have to edit players as suggested, though it works, because they will have one-year contracts and you'll have to resign them. Example, Mariota likely has a 4-year contract and editing/signing/trading results in him having a one-year contract. You would have to edit/release/ sign and either trade for him or sign him from free agents. It works, but I would rather have him with his 4-year contract.