Hi Bridget, if you PM with your address i can definitley send you 2/3 different books on training which you can borrow for a few months and post back to me when you're done with them. If you're really serious about getting fit and racing how about getting a good coach - there's a BCF coach called H. Williams who I here is pretty good
The cheaper option is to simply start training properly. This usually means training harder.

With an average of 8 hours per week you could get pretty fit on 1/2 medium lenth rides per week and a couple solo 20-40 minute time trial paced ride per week. If you find it hard to motivate yourself to ride hard then get out on some faster group rides or do actual TT's as training. Oh and in my experience and others I've spoken to the worst thing you could do as a time crunched amateur is more slowish (15/16mph) long group rides -apart from noobies and those with 25hrs + training they really don't help you get much fitter once you'e reach a certain level of fitness. In short get your butt into the uncomfortable zone for at least 90 minutes per week and after a few weeks you'll start to notice the difference. Good luck
