As a former dancer. Take as many ballet classes that you because it will increase your core-strength as dance and also your stretch. You may not be a principle dancer and may have to settle for being just part of the chorus.
Given your gymnastics back ground I doubt that you would not be selected as an under-study.
I was an under-study for a show once and ended dancing the part because the dancer selected has a lot of issues.
Dance truly has to be your passion and you have to be ready to eat, sleep and live dance. Much like what you did when you were a gymnast.
Also study as many disciplines that you can because it makes you a more well-rounded and sought after dancer.
I studied five disciplines. My strongest techniques were. They call it contemporary now-in my day it was called Jazz, African Dance(Senegalese, Congolese, African Hiatain), Ballet, Tap, Modern.
If you are still in college take a dance class as your elective and then if you like seek out a local dance studio and take classes there. They usually have a student discount rate.
Also look into a summer dancer seminar. I attened one when I was your age, it was awsome.