The best strength training exercises are called "compound" exercises. These exercises jolt the body into growing faster than other exercises. There are several ways to approach training. Most women fear lifting weights as they believe they'll bulk up and look funny. This actually takes more work than you think and the weight involved is normally very heavy.

You can still be strong and fit without looking like arnold swarzinegger's twin sister.. lol. Since you don't have access to a gym, you'll proably want to do something closer to home. Like pilates or tai bo. These will work your aerobic side and give you strength. You can also try isometric exercises. This requires NO weight, only resistance. ((Feel free to look these up online.))

Good luck!