What is best fitness club or diet for a 24 year old woman?

I was looking online at weight watchers,bally total fitness and curves.They all look so good. I would like a combo of going to a gym with a personal trainer and someone who will teach me about healthy eating because I want this to be a lifestyle change.I am confused because there are so many options out there. I am hoping to lose 50 lbs or more.Please helpWhat is best fitness club or diet for a 24 year old woman?Curves is fantastic, u should give it a try