How much should I exercise to lose wieght, and how much weight training- cardio should I do?

Please keep your responses brief

Hi name is Shelly, I have never wrote one of these before. I went through 5 years of behavior modification therapy to quit smoking (I went 9 rounds with those little filtered bitches) I have not smoked seen March 2011. I have gained 75 lbs. I don't know what to do now, I just don't know how to lose ...