Swimming to lose weight?

Hi all I am new here. I am wondering what is a good routine to swim and lose weight? I am close to 250lbs right now and don't look good fat LOL. was doing some research and found an article written by USMS' own Bill Volckening (if he posts here, hi Bill!) that talks about how he lost weight by swimming and changing his diet, but he don't talk about the swimming much, just the eating. LOL and i've had enough eating. His story is very inspriational though and I want tofollow suit! I've started a diet but I need help with swiming! ANy suggestions?? ThxU!