Im 17 and the youngest in the team

Each member of the team is doing it for a different charity, im doing it for alzeimers.
I was just wondering... we leave in late october,
Would you lot suggest:
Training now?
IF so how much?
IF not, when?
I am concerned about getting bored of biking and loosing motivation for biking if i start training for it now...
Just wanted your opinion, thanks a lot.
Seb
(i know its a crazy idea, but i was asked to join the team, and i had two choices either do it, or dont do it, but ive booked the tickets now, non-refundable, so if i fail then looks like im going on holiday
