Choose to play as a GM in 24/7 mode. Choose a pre-set roster, and set your champions. Go forward a couple of weeks into the calendar, and simulate matches up until that date. Renew the contracts of a few of your superstars for as long as is possible (make sure you include your champions). Go to the calendar, select a date just before the contracts expire, and choose to simulate up until this point. You will have made enough to renew the contracts again. Repeat the same procedure until you get to WrestleMania. You should get there with a couple of decent superstars to compete in a championship match. Put the championship on the line, and fight the match to unlock Vince McMahon.