Please help me lose weight: ?

I gained a ton of weight due to major depression and the dreaded freshman 15! Could anyone give me a good way to kick start a healthy weight loss plan and then a constant regimen I can follow. I'd like to lose a good about of weight at first and then keep the loss steady there after. I am on a dance team and practice for 2hrs twice a wk. I'm also fairly muscular but still larger than I want to/ am accustomed to being. I am 5'4 about 165 lbs, I used to weigh 125 and was SKINNY (because of my musculature) so I think that between 130 and 140 would be a good size for my body type. I do need to lose weight quickly for an audition as well, if I can get down to 150 ASAP and then lose the rest the right way...