Based on your stats, if you're just starting out do not do weights and cardio on the same day. Try a moderate weight training workout 2 or 3 days a week with at least 1 day between them and do cardio on the "off days".
If you want to start a weight training workout (which would absolutely be beneficial) you might want to start with just 3 compound exercises for at least a few weeks until you're comfortable with exercising and are a little more conditioned. If you do presses, rows, and bodyweight squats (to the best of your ability), you'll be hitting all the major muscle groups each workout. Try to do three sets of each with 12-15 reps per set. That shouldn't completely wipe you out or make you too sore, but will give you a good foundation and help you build some lean muscle which will ultimately help you lose weight. If you think you can handle it, use a weight that you can only do 10-12 reps per set - the last rep should be tough but not to muscle failure. After 3-6 weeks, you can expand your workout to isolate muscles like biceps, triceps, shoulders etc. if you wish.
For cardio, if you can do 45 minutes straight, that will probably be more beneficial than breaking up the session into two shorter sessions. Once you get your heart rate up and burn off your blood sugar, thats when your body taps into fat. If you have to go through the initial glucose burning phase twice, you're spending less time burning fat overall. It should be a bit of a struggle, so if it's kind of tough, that's good. If it actually hurts (joints, lungs etc) then two sessions is better than hurting yourself.
Re: Exercising Question. 
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