HIIT= High-intensity interval training - (( Google that shit, or even use the search function on the boards. Lots of stuff out there about it)
I was a rather larger guy myself.
6'3 , 310lb, 44 waist size pants.. and only at 23 years old. Poor eating habits, larger unwarranted plate sizes and just the static life style of most people my age.
After spending a bit of time reading different diets, and training logs on this site and others, I've manged to drop a lot of my weight and improve my overall health.
Currently I've gotten myself down to a respectable 223 in about 8 months.
Just as the first post said. - High protein, low carbs. I hit the weights at my local gym ( old school, 1980's weight sets, no staff, honor system, $20 a month membership) 5 or even six times a week right after I get off work ( midnights) cut rest time between sets to keep things pumping and really just give it my all.
Dropping all that weight and really seeing changes occurring kept edging me on. Soon enough I had confidence to apply for military service, having always fearing I wouldn't be fit enough.
I leave in December for basic having passed all testing and meeting all requirements.
Good luck to you in your training and reaching your goals.
