I wouldn't want to have too many well-known "stars" except to put over new guys. If watching Lucha Underground has taught me anything, it's that name recognition only goes so far. I gave a shit about the majority of that roster and had no clue who they fucking were.
I for sure wouldn't hire any part-time guys like Brock Lesnar. There are a lot of guys out there that could be my "Brock Lesnar".
I would recruit guys out of College wrestling pretty heavily for my wrestling schools, actually pay them a good deal of money and allow them to compete in MMA since a lot of these guys are planning on heading to UFC over WWE these days.
Here's some guys I would fast-track to success:
Robby Smith
Dom Bradley
Toby Erickson
Tyrell Fortune and Anthony Nelson
John Krahn (7 foot, 400+ lbs)