If you have the 30DS you're more than welcome to hop into ***November Challenge: 30 Day Shred*** where we post on how we're doing with the 30 day shred but there's no official beginning or start. You'll find that a lot of people are still on the first level (I am......)
As for TBL, I'm not sure if teams are set yet, but I think there's another for planned for after this. If you post in the 20-somethings Official Biggest Loser thread then maybe someone can help you out in there