I got back into swimming a couple of years ago and I am a terrible swimmer. Here are some things I thought were helpful. Use fins, they will help you swim for longer distances and times. You can also use a pull buoy to balance out and work on arms. I swam one lap freestyle one lap breast stroke because I was awful at freestyle. Wear the right gear. One piece swimsuit with no skirt that fits you, swim cap, goggles, ear plugs. Ear plugs made a huge difference for me. I also swam laps and water walked laps in the very beginning before I discovered fins. Now I can swim freestyle laps for 45 minutes pretty well.