Zero to 1 mile would be a good start for swimming. Like you, I had never done any swim training in my life when I decided to sign up for some triathlons. It took me about 6 weeks, 3 swims a week, to get to swimming a mile nonstop. From there I started using some free workouts from swimplan.com. I’ve never followed the TR swim plans. Take some video of each other and post on slowtwitch or the swimming subreddit for some form checks. That helped me a lot.
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