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I studied kinesiology for a year before deciding that neuroscience is my true calling, but if you just want to improve "general fitness", then you should try to mix aerobic (i.e. Cardio) and anaerobic (i.e. Weights) exercise. Something that could work is 30 minutes of weights (what I used to do was 3 sets each of bench press, dead lifts, bicep curls and squats, increasing weight by 5lbs or so each time) and then 30 minutes of biking or running.

If you want to lose some weight while you're at it, incorporate high-intensity interval training into your cardio routine. So alternate sprinting and jogging. What I used to do was spend 8 seconds on a bike going as fast as I could, and then going at a more leisurely pace for 12 seconds, and repeating until 30 minutes had passed.

With respect to weight training, the idea is that if you want to gain more muscle, do fewer (~6) repetitions, but use heavier weights. If you want to burn more fat, do more repetitions, but use lighter weights.

Oh, and talk to a doctor before starting any sort of exercise routine, just in case. They might also be able to point you in the right direction.