Your turbo trainer's out of shape? Get on it and ride. The training stimulous will kick up its fitness level amazingly quickly. It'll be able to keep up with you in no time at all.
Sorry, I couldn't resist.
OK to be serious, without more knowledge of your setup, fitness level, and goals it'd be really hard to recommend much more than for you to:
- Get on and ride hard on days you feel good and ride easy or rest on days you don't.
- Avoid overdoing it with too much intensity and/or hours on the trainer because you don't want to peak in March.
If your goals are such that you need a plan I'd suggest you consider working with a coach. The off season is a great time to get to know a coach, much better than after the season has started in earnest.