Check out Joe Friels Cycling past 50. He has a section on weight/strength training in there. Or if you're really interested in weight training join a gym temporarily, hire a trainer and take it up for a while. Here's some links about cycling and weight training. Just remember, you get what you pay for.

http://www.cptips.com/weights.htm

http://epicidiot.com/sports/weights_cycling.htm

http://www.roble.net/marquis/weights

BTW: My waist is considerably larger than 31" and it ain't muscle. Congrats.