[Luckypants]

Looks pretty reasonable to me (not a serious cyclist though). I would concentrate on building aerobic fitness first by doing your rides to work and weekends at an easy/moderate pace and build up the miles. 50 miles is relatively easy to achieve. Time in the saddle will give a good a base and build from there. Aim to go over the 50 mile distance when you have built up to it, then start looking to go faster.

Hills can be a sufferfest, but to try to avoid that make sure you use your gears so that you keep the legs spinning rather than trying to horse it up the climb in a big gear. Climbing seated is actually more efficient than standing. If you find that hills are not getting easier with the training you are doing, look into doing a spin class, it made a massive difference to my climbing ability.