I may not be an expert at workout but I would like to put my few words on it. As I have been workingout. I would say not full time. I am in and out of gym routine quite easily. But to get the better start for the starter, you need to reduce your weight. Only way to reduce weight is watch what u eat plus cardio.
I think eating is 80% and 20% is the workout. Plus you need to watch what u eat. Healthy food are one way of reducing weights. Most important is reduce sugar or no sugar for few weeks. Also no cup noodles as it has lots of sodium in it. Read the food labels.
Another important aspect of food is eat breakfast like a King, Lunch like a prince and dinner like a beggar.
Eat 5-6 meals a day is best way to increase the metabolism.
In order to reduce weight you need to increase the body metabolism.
Another important thing is no alcohol. They add empty calories to your body which will turn into fat.
Working out twice a day works out perfectly. In order to be in better shape, you need to reduce your body fat first. Cardio and food are the only ways to reduce the body.

These are my thoughths. Been working out but not committed to it.
FYI, I reduced 25 pounds ever since I started working out since last year.