If I want to start doing cardio and weight training, what would be a good way to split up my time?

I feel like I didn't phrase that correctly, but it's the only way I can think of. What I'm wondering is how I should split it up as far as what I focus on each day. I would want to do cardio 3 days a week because I enjoy it, but I've never had any experience with weight training. The people that I know who do focus on one area each day, but I'm confused about how to make like a weekly program so I don't over exert any one part of my body.
If I want to start doing cardio and weight training, what would be a good way to split up my time?
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