Well, depending upon your flight time and experience (and a little luck), you could start as an FO on the GV. It's possible. Who knows, you could start as an FO on the 7X if you time in correctly and you fit their profile for experience. You are more likely to start in a Bravo, XLS, Beechjunk or Hawker but you never know - it depends on your experience and the company needs at the time from what I understand...
If you are heavy on experience/hours you are more likely to start on a Bravo or XLS because you would be ugrading faster and they would want for you to have experience in that aircraft (start in the Bravo and then upgrade in the Bravo). If you meet the minimums but are lite on overall experience/hours, you could potentially start in the Falcon 2000, GV or even 7X so that you could continue to learn from the more experienced PICs until you are ready to upgrade into the Bravo or XLS.