How much money do you want to spend?
There are plenty of books on Amazon to add to your training repertoire (sp). Almost all of them are geared toward you building your own training plan from where you are to where you want to go. Many of them are geared toward training to racing, but you can "race train" without wanting to race.
I've committed to Joe Friel's
Cyclist Training Bible 3d Ed. for this coming year.
Or, if you want to pay for coaching, there's plenty of sites for that too. You can start with .
http://www.trainingpeaks.com/.