Exercise Program? Need help, please.

I recently started going to the gym and I know I need to start out slow and steady. So, I'm doing 30 minutes of cardio and 20 to 30 minutes of using the weight machines. I'm doing 3-4 sets of 15 reps with low weights. I'm not sure if that's right? Of if I should be alternating weights on how many days a week? I need some kind of schedule or guidelines to go by and I'm having trouble finding some. Any advice?

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