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I found the Wii Fit Plus and Balance Board very helpful when the weather is crappy and you can't get out and now I'm addicted to it. I also bought the Fit in Six by Wii and I love it. At first I thought this is just another kid's game, but the workouts are great and I work up a sweat with them.
I do DVD's at home and have some free weights. Do you have access to any equipment at home? I think you can find good info under the fitness tab at the top of the page on equipment less workouts. A good combination of strength training and cardio 4-5 times a week would be good :) If you don't have weights, you can start with body weight stuff like planks, push ups, pull up's, etc.
i have an elliptical trainer and stationary bike at home and small weights i love to work out at home because i dont have to drive anywhere and the best part, i dont have to do my hair or anything
Check out www.bodyrock.tv
They're awesome, but hard. All you need is a mat (or a carpet ^^) and I guess a computer to watch the video.
Anyway, good luck!