For the treadmill or any cardio, 30-45 minutes is a good range. If you can do cardio first thing in the morning, that would help burn off the fat. But if you're like most people, you probably can't spare more than 30 minutes.
As for weights, since you're new to it, start out light. It's important to develop proper form before trying a lot of weight. It also depends what your goals are. Generally, they say if you want to build muscle, do few reps at high weight and if you want to tone, do lots of reps at low weight. I don't know how true this is, but you need to figure out how much weight you can safely handle. Pick a weight where you can do 8-12 reps. If you can do more, increase the weight and if you can't do 8, decrease the weight.
Don't worry about trying to look like a supermodel. They look unattractive and unhealthy.
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