Next step now is to decide what kind of training device you want to invest in. The most common and easiest to use is the rear wheel trainer. These turn your current bike into a stationary bike like ones you can find at the gym, but better because its your bike. Attach your bike, turn on the TV and go crazy. The other option that are less popular are rollers. This is because they require some skill to use and also require that you pay attention since you aren't attached to the trainer and are actually just balancing on the rollers. Adaptors are available to make rollers semi stationary.
So which one do you choose? Maybe you want both?
Trainers are better for building strength and endurance
Rollers are better for improving balance, pedal stroke and efficiency
Come try out either type at the shop to have any other questions answered, or check out the Cycle Ops site for more detailed information.
Rear Wheel Trainer Option
Roller Option (top) and with fork adapter (bottom)
Click on image to see different rear wheel options