You might find this link helpful:
http://forum.videofitness.com/showthread.php?t=49734&highlight=rotation
I'm fairly new to doing my own rotations, but I know there are lots of ways to arrange workouts, just as long as you don't work the same body part two days in a row (like if you do a strenuous upper body workout one day, you wouldn't want to do it again the very next day but you could do cardio or lower body the next day).
This week I'm doing something similar to the second rotation on that link, but next week I'm doing a 3-day split, like this:
1. Chest & Shoulders, Core
2. Cardio
3. Lower Body, Core
4. Cardio
5. Back, Biceps, & Triceps, Core
6. Cardio
7. Yoga/Rest
I could also add cardio on any of those weight days as I feel like it. Some people will also work a different body part every day--but when they do that it will be a long workout for each body part--very intense. When I do the 3-day split I spend 45 minutes to an hour at least on each body section. Some people will do a 3-day split and also add a circuit workout (cardio and weights alternating) somewhere in the week.
l also try to change up the cardio. So I wouldn't do high impact step every day because it's hard on my knees. I might do high impact one day, kickboxing the next, then low impact step the next, then jogging, or whatever.
The different rotations also depend on your goals, but someone else could probably tell you better what each does for you. It also might just be based on what you find happens to work best for your body after you've tried a couple different rotations.
Hope this is helpful.
***Lainie***
"The worst loneliness is to not be comfortable with yourself." -- Mark Twain