I'm doing swimming for my main exercise. I'm trying to swim 30 to 60 minutes everyday that I can fit it into my schedule. Most days, I can.
I don't really swim the "proper" way. I started with dog paddle, then adjusted to the tarzan stroke (head stays above water, by longer strokes), I kinda just crawl across the water.
I wouldn't worry too much about weight-loss as being your priority. You will feel so much better after your swims. You can add in other things and other classes/equipment to keep it interesting, etc....
Floating on back is good and then you can use your arms and legs to move yourself.
Butterfly stroke is good since you just bob down and then use your arms to bring your head back out of the water.
I started slowly with the above strokes. I keep practicing my breathing and can kinda do the swim stroke and breathing to side. My form is not "traditional", but I'll keep working on it.
Someone also mentioned to me to use flippers and a kickboard. So, I do this some sessions to get more leg work in.
I also use a snorkel and mask sometimes and then I don't have to worry about the breathing. But, of course the snorkel takes time to get used to. Of course get snorkel that has a top that prevents water from getting in.
Some people walk in the walking lane.
I've seen some people do an aerobics work out just in the walking lane.
Some people really like the aerobics classes. You get to meet new people and that keeps you going to.
Swimming for me can get kinda boring, but mixing it up by using my toys above keeps it enjoyable. And then I've also met some nice people at the pool and that keeps me excited about continuing to go.
The water also feels so good right now.
I've been swimming almost daily since January.
I'm not a fast weight loser, but the scale is continuing to go down. But, I'M losing INCHES. 25 inches.
The most difficult thing for me was finding a pool that I was comfortable with and I was lucky to find a pool and athletic club that is a good fit for me. They have an inside pool.
Also, when you go and check, see when aerobic classes are, pool areas, adult swim times. Make note of when the highschool kids and swim teams might be monopolizing the pool and make sure your schedule will also work around the busy pool times.
I have to either go REAL early, 5:00am to 8:00am most of the time. Or after 7:00pm most days. I work and don't have access to maybe some other morning hours that might be light usage.
Good luck and SPLASH!!!!!