Adding power at your stage is a great idea. I like to do power exercises early in the workout. You run out of power before strength so you need to do them first. They also serve as a warmup for your main exercises. Most power exercises rely on legs. You should do legs at least twice, preferably 3 times a week but it doesn't heavy every time. try Heavy, light, med or something like that.
Start a typical workout with warmup (Check out Crossfit and look for the burgener warmups. www.crossfit.com/cf-info/excercise.html#Oly
Next add a clean or snatch variation, then your main leg workout, say front squats followed by Romanian deadlifts. (always do them in that order to protect your back)Then add a push and pull upper body and you're done.
They work great in combinations. Power Clean>Front Squat>Push Press is a classic combination and works the whole body. Great for a short workout. Do that alone and you're done in 20 minutes.