What specific exercises can I do to lose 50 pounds quickly but not too quickly?

It’s very difficult to lose weight only making a specific exercise, you have also to change your diet. When I say diet, I’m thinking in something very sound, and long range, not for only a period. It must be changing for better, with plenty of pleasure to you when eating. Something to keep for a hole life. To achieve this kind of diet, it would be better to ask a nutritionist to plan with you, what you must eat from now on. Then come the exercises, the best one is walking. The problem is if you’re too much over weighted, you’ll need first to lose some pounds to relief you knees, before an exercising program, as walking or running (this must be a second step). Abs and lift weights are also great.
As soon you take the decision, it’ll be easier for you, go on, you can do it.
Good luck.
P.S. I wouldn’t say diet must be a food restriction, as explain above.It’s the right choose to eat healthy but with lots of pleasure. Why don’t you try walking? Increase gradually but do it. The first 3 month of exercising are always difficult. After this come the opposite situation, You’ll feel bad if you can’t do it. If I were you I wouldn’t decide for a healthier life just because of a dress, it’s something far beyond, it’s feeling good and happier.Thank you.