Maybe not. If you are young -- and even if you are not, but are in reasonable physical shape -- you may not have to do that much training. In fact, you may be fine without any training. Just ride as much as you can in the coming year. Many people discover that training to get "in shape" is not a good motivator. I would suggest instead that let pleasure be your guide. Go out for an hour's ride after work to unwind. On weekends or holidays, head out on 20 or 30 or 40 mile spins to someplace nice. Try loading up your bicycle and going three or four hours in one direction, stay overnight, and return the next day. Take a course on basic bicycle maintenance. It's a good feeling to know you can adjust the brakes or derailleurs whenever they need it rather than wait for a mechanic.