It's tough being a big guy..I'm 6'3, 265lbs. My goal is to weigh in the 230's (Thats light for me haha). I just started swimming for cardio. I'm up to 2500 meters a day, 4 days a week. It takes me about a month to lose 20-30 pounds of fat. As far as a diet goes, I just watch what I intake. I recommend 5 to 6 small meals a day (speeds up metabolism).
Daily amount
Calories: 1600
Fat grams: 20grams
Carbs: 70 grams (mostly complex carbs)
Fiber: 8-10 grams
Sugars: 40 grams
Protein: You body weight in grams. Example, if you weigh 200lbs, then 200 grams of protein a day....This is only important if your lifting weights (1 hour a day). If your not, then .36 grams of protein per pound...I would prefer .50 grams; however, docs like the lesser of the two
In regards to protein, you body can only intake about 40 grams of protein at once.
If you really want to burn fat fast, then combine weight lifting and cardio in your daily routine.
Good luck and train hard!
Pete