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You don't really have to do cardio, but it is good for you. I couldn't fit it in because I worked from 9AM to 5PM, and by the time I clockedout, I was knackered. Anyway, you can't outrun a giant calorie surplus. Basically, count your calories. Download an app called myfitnesspal and log everything you eat. Try to eat 20%~25% less than your TDEE (myftnesspal will calculate this for you or you can Google any of the TDEE calculators out there).
A pound of fat is 3500 calories. If your TDEE is 2000 calories, then you could just eat 1500 calories; a deficit of 500 calories (which, 500*7=3500, is a pound).
Play around with it, find something that works for you. When I was obese, I use to lose just over 2 pounds a week, but as I came back to normal levels, it became harder. I didn't really eat healthy, I did it on the same diet I always had, I just ate less. You could cut out stupid stuff like cola, beer, and weed (makes me eat a lot for some reason), and get great results in the first couple of weeks.
It's a long game, and you have to be committed, and not get disheartened easily.