Hi Nancy!
You are already on the right track. Generally speaking, to lose weight and tone up, you would need to do cardio at least 3 to 4 times per week, do a total body weight training workout at least one time per week, and eat a healthy and balanced diet. You are already doing all of the above so now all that you need to do is some fine tuning.
Before I go into any detail I just want to say "BRAVO" for taking the bull by the horns and stepping into action. As a matter of fact you already have the hardest part under your belt.....changing those eating habits. It takes about three weeks for your body to start to adapt to these changes and then it all gets a little easier. Since you have changed your eating around in the last 3 to 4 weeks, you will most likely see some nice new changes within the next week already.
Now onto your workout plan:
First, you said that you have not been faithful to working out for the last month. Because of this, you should ease into the pace of your workouts for the first two weeks by doing cardio every other day. Do the PS tapes with this rotation too.
Monday........Circuit Max
Tuesday.......PS Back/Bi/Abs
Wed...........Cardio Kicks
Thurs.........PS Chest/Shoulder/Triceps (add a five minute ab workout to this)
Fri...........Step & Intervals (cardio portion only)and go right into PS Legs/Abs (but skip PS warm up)
Sat...........OFF
Sun...........Power Circuit(cardio portion only)but don't cool down. Go right into the "intensity drills section" of Cardio Kicks(add a five minute ab workout to this).
After two weeks of this rotation, your body will be more conditioned to handle the Xpress series which involves cardio on consecutive days. While on this six day per week workout plan, listen to your body. If it is feeling a bit sluggish from this pace, you may need to do 5 days a week or perhaps cut back to 5 days every other week. Another thing thats a good habit to get into is to push extra hard on one cardio day and not quite as hard on the next cardio day. Each week you should switch around which of the six pack Xpress series you are going to give your all to.
So after the two week "ease on in" phase rotation, you can begin doing the Xpress series tapes rotation as is (with modifications where ever necessary).
So its:
Monday through Saturday any Xpress tape of your choice but try not to put Power Circuit and Leaner Legs back to back. Two days of another Xpress tape in between these two tapes would be great.
Do the Xpress series in this manner for three weeks. After three weeks we are going to start incorporating a bit more weight training since you said you wanted to add a second workout for each body part. (NOTE: Notice how we are adding things in slowly so that you don't do too much too soon and either 1) injure yourself or 2) burnout.)
After three weeks on Xpress rotation, here is week 4 through 6.
Mon....Power Circuit in its entirety plus add on PS Chest/Shoulder/Tricep
Tues.....Kickbox in its entirety
Wed......All Step in its entirety
Thurs.....Step & Intervals in its entirety plus PS Back/Bicep/Abs
Fri........Leaner Legs plus the floor work portion of PS Legs(so its the section that has inner thigh, outer thigh, hamstrings, but leave out abs since you already had them on the Leaner Leg tape)
Sat........10/10/10 in its entirety
Sun.....REST
Week 7 and 8 you can add an additional 20 minutes of your favorite cardio to either Wed or Fridays workout.
Good Luck, and remember to listen to your body and modify when needed. Stay focused, stay determined and be patient!!!