Given your schedule, you will probably want to get a split routine working... where you work different muscle groups in 3 or 4 sessions a week. The best advice I can offer is to work muscle groups that oppose eachother or upper and lower body on alternating days to allow for sufficient rest and recovery.
What I mean by that is this: If Monday, you train chest and shoulders, on you next lifting day, work legs or back (Ideally, legs, since shoulders are also used in back movements). Just as an example, right now, my routine looks like this:
Sat: Chest-Shoulders-Calves
Sun: cardio
Mon: Back-Legs (quad, ham, glutes)
Tue: cardio
Wed: Bicep-Tricep-Abs
Thur: cardio
Fri: cardio or rest
You might consider looking into some fitness books that show the muscle groups and which exercises work which muscles. To gain strength and mass, you want to lift until the muscles are significantly fatigued. If you are looking to get more toned, and lose fat, lower weight and higher reps will help to maintain muscle density and keep the heart rate up throughout the workout (in conjunction with clean diet and cardio).
Hope that's helpful.
Naxis
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Keep your body lean, your blood clean and your mind sharp. -Rollins
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