I would first suggest doing a search here on TE as there are tons n tons of threads about training for centuries etc...

I've done a quick search(off to make brekkie) & found a few things...

http://forums.teamestrogen.com/showt...ntury+training

http://forums.teamestrogen.com/showt...hlight=century

Also, quite a few folks have posted after notes about what they'd do differently...have a peek at those too.

Keep motivated & remember your goal.