Do you have any tips for my swimming workout routine ?

I’ve started swimming recently and I made a little workout routine for myself:
First I do about 5 laps on my back to fix my breathing and warm up. Then I do 10 laps of breaststroke since I find it to be the easiest style and the last 5 laps I do front crawl.
The pool is 25m long, I haven’t tried yet but im sure with a bit more time I can do more, my average workout is about one hour. But since I just started I want to have the right routine so I don’t just waste my time.
If this is relevant here’s my height and weight:
5’3“ 100lbs
My goal is to get more muscle definition and I heard swimming can reduce swelling as well