Hi NMcgann
Since posting my original request I have been doing what you've suggested and focussed on distance. I have now built up so I can ride 50 - 60 miles covering an altitude of 3500 feet - so some hill work too. It's helped me 'grow' into my bike (I changed the saddle from a small man's sadddle to the next sized man's saddle with gel - much much better) so I'm really pleased with that and will be doing my first 100k ride on Sunday. I haven't focussed too much on speed but sometimes I'm now doing an average of between 12 - 14 mph over a distance ranging from 30 - 40 miles which is also an improvement from 8 - 10mph. However I'm not so worried about speed but more interested in building strength & endurance which I think this will automatically help my speed? If you have any further tips I'd be interested to know them.
Thank you for responding.
I'm glad that things are progressing for you, there's a lot to be said for just riding the bike more as an initial training plan.
Actually, I would have flipped your statement round and said training for speed will automatically help strength and endurance. Most of the things that you have to do to get faster (at least for event durations over 5 mins) are common to any training program.
It's difficult to know exactly what to suggest next - almost everything leads to the slippery slope that is structured training. There are various sessions that you can do (e.g. the often mentioned "2x20 threshold"), but unless you know how hard to do them, how to measure your performance and at what point to do them in the training year (relative to the time that you want to be on top form) then you probably won't get the benefits you are after.
The most productive thing that I think you could do in the short term is to join a local cycling club (a large one that has a wide ability range). Riding with other people makes things a bit more challenging and you get a good idea of how your fitness is progressing. You are pretty much there on distance and speed for a lot of clubs slower groups, so I wouldn't worry about that (you'd be OK with my own club's "touring" group).
Beyond that, do some reading of training books and articles. Joe Friel's "Cyclist's Training Bible" is a good start for general principles. (his blog makes a lot of sense too
http://www.joefrielsblog.com/) I'd expect you'd find the subject hard going at first, but it won't be long until you spot the common concepts and see how coaches recommend that they be applied.
One difficulty that beginners to training will always find is that there is no definitive approach that will work for every person , every coach and expert has a different slant on how best to train and different types of events (e.g. timetrials, road-racing, sportifs) require somewhat different training programs. It can be hard to know just what to do until you have quite a bit of experience. The good news though is that for beginners just about anything will work provided that the training program isn't so hard that they can't do it! It gets a lot harder to progress once you have been training for a few years...