www.cptips.com has a lot of information, maybe even an overwhelming amount.
Take in lots of carbs before your workout, but not right before because it's uncomfortable exercizing on an full stomach.
If you are exercizing intensively and/or doing it for more than an hour or two, bring something along to eat during your workout in order to replenish your energy. Bannanas, fig newtons, and dried fruit are common. I hear energy gels do the job well, but they are expensive. You will need to take in about 60g of carbs per hour, equivalent to one energy gel every 30-45 min.
Take in more carbs and proteins right after the workout for recovery.
Remember that water is even more important. CamelBaks seem to be effective when you can't reach down to grab a bottle.
Don't train every day, give two or three days per week to rest.
Stretch your quads, calves, hamstrings, and inner thighs before you do anything.
Exercizing on a stationary indoor bike isn't as good as on a real bike, because you don't need to balance, or steer, or fight wind resistance. In the winter you may want to consider rollers instead. It is like a tredmill for bikes, and if you get it with a head-fan, you can accurately simulate a real bike ride. Rollers are also good because you will stay used to your bike, the feel of it, the posture, and the seat.
That's it for now. farewell : )