Re: just starting
I can only speak from my experience. I used to do the cardio thing 3-4 times a week with some haphazard lifting in between. Didn't see squat for results.
Got a trainer to show me how to lift correctly, got started on a regular routine, cut the cardio to 1 or 2 times per week. Finally saw results. I would have seen even better results had I got the diet part straightened out.
Bottom line- cardio will help your heart health but it won't do as much for your body as lifting regularly and getting your diet under control.
Lifting means using enough weight to make it tough, not those little pink 1, 3, 5 lbs weights!