Best way to lose weight and get in shape?

Alright So I'm 23 and I've lost a good amount of weight before going from 240 to 150. However in the course of my 5 year relationship I've gained allot back. What are some tips and tricks to get back down to a good weight. Recipes Anything would be helpful. I know all in all walking is the best exorcise however what could I do to go along with that to help increase weight loss?