First, Go onto the internet and look for area swim teams or neighborhood swimteams.
Second, When you find a swimteam in you're area that is easy to go to you might want to check their hours and see when their practices are to make sure you can make it.
Third, If their hours work for you then take a look at pricing for one season. The higher the price usally the better swim team but you might if it's out of you're price range thats ok! You might just want to keep searching.
Fourth, If everything is all good contact the team! Note: You might need a physical to join the team so make sure you have one ready