What Is The Best Exercise To Flatten My Stomach And Loose My “man Boobs”?

I am on a strick diet and exercising to loose 40 pounds. I have been overweight with a belly and BIG MAN BOOBS for 30 years. I know my skin is streched out big time from all of my streach marks. I would like to know the best exercises to help me flatten my stomach BUT I really want to loose my MAN BOOBS. I am turning 50 and have been doing 150 sit-ups a day and lifting weights every other day and ride a bike for 30-40 minutes a day. PLEASE someone let me know the best way to get faster results on flatting my stomach and to loose my MAN BOOBS!
I have been dieting for 4 weeks now and have lost 22 pounds, stopped smoking and exercising. I am so motivated because I have meet a special person in my life for the first time and I am totally embarassed by my body fat. I am not good at goind to a gym at all. I have a dear friend that is helping me out. I also do not eat anything after 6PM. SOmeone PLEASE help me out.
Rich

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