From what I gather, you’ve been doing nothing?
Not lying, if you were my client I’d start you training 3 days/week and doing ZERO cardio. There’s no reason to add it yet.
You need to establish a foundation first. Cardio is just another tool and if you start off doing too much, where do you go from there when your progress stalls? Looking at it another way, if you can kick start your fat loss journey in the right direction without any cardio AND simultaneously building muscle…why wouldn’t you?
I can guarantee that, while you may lose weight fairly quickly on 6 days of cardio, you won’t be happy with how you are looking. You’ll be a smaller version of your current shape. Then when you suddenly switch to weight training, you’ll have to drop cardio if you want to progress, and you’ll gain weight back fairly quickly since your body has adapted to high level of caloric output from so much cardio.