A years training

Hi all, im new to this site. Ive been skiing for eleven years on and off. Il be heading over to Canada in 2010 to Vancouver island to do a course in the Section 8 12 week "Snowsport Leadership Training" program. For this you will have to be very fit as its very competive. So i want to get myself int top shape but im not sure how to go about it, also i wish to change my diet as i dont eat the best at times. im 21 at the moment and i weigh 13 stone. So i want to get myself sorted for this course

anyone has any suggestions or tips

You can make a pretty good combination of exercise out of Yoga/Cycling.

With the eating it depends how extreme you want to go?

I want to go pretty far, i have one year with a hell of a lot of spare time to do anything i want. Also i want to start entering competions again after this course along with working abroad