Just wondering how most people train for a century ride???

My co-worker has talked me into doing a century ride the first of June so I just want to be ready.

First thing is to buy a road bike.

Since I live where we do get snow I don't know when I'll be able to get on a bike.

Right now I go to the gym at least 3-4 times a week & sometimes more. I do the elliptical machine for an hour & then try & get in some weight lifting but I need to work on that part harder.

At work I probably walk at least 5-7 miles a day so I don't just set at a desk.