So I made a facebook group oneday..

and basically I wanted to donate to a FB user my Xbox since I was off to university and wouldn't really need it. McMaster Health Sci

Anyways I got about 1500 members, how can I make money off this. What directions do I need to take?

send them to a site you've monetized or sell their emails would be my instinct

Wait until the number of people joining your group slows down (get as many members as possible), then "give away" your Xbox. Notify all the other members of your group that unfortunately the Xbox has been taken but you've heard they can get a free one by simply following this link (aff link to xbox submit). Close up shop, get a new pva, repeat.