It's always up to ypu, yes it would help you burn more cals and fat but will also put alot of stress on your muscles so be sure to have a day off or a day with just lite walking.
Most people I know and how I do it is start as heavy as your 12 rep max is and then set 2 drop a little so you can still do a clean set but with it still stretching your muscles and the same for the...
After 2 years I would start out slow and low, build your cardio back up and then same with your muscle structure. Once you’ve done that after 4-6 weeks then I would start to get more and more intense...
Let's see how to start, I was bodybuilding for along time and then I blew out a hernia in my groin and took 13 months to get the surgery done because the doctor thought there might be another one one...
Eating is a good idea but be sure to still do some cardio so you don't end up to fat, just eat as much as you can to fuel your lifting and then do cardio on your off days.
Being in the Army I try and make my soldiers do them every day, I used to do them non stop but now that I've put on an extra 20lbs of weight for my weight class I can only do 20.