Hey I think that is great. I too am training to get ready to ride in a century sometime this fall. I can't really give any advice or tips since I am looking for them too. My only advice is to have fun every step of the way. I just try to ride everyday if possible. Some days I ride 20 or 30 miles and try to keep the pace up that I want and other days I try doing sprints (ride as fast as I can for maybe 50 yards then ride slow 50 yards and keep repeating this till I have had enough. Yesterday I tried spinning and I think it really helped me.
One thing I can truly give you is lots of encouragement. You can do anything that you truly want to. You will make it and so will I.
Good luck and have fun. Let us all know how you do.
Vicki