You should start with something. Something as in something small. There are a lot of dancers who join dance academy of a known professional just to see how every thing works out (Analysis purpose). At the same time you need keep yourself updated with the competitions and talent hunts taking place within the country and abroad too (if you want too). working hard for these competitions will certainly give you edge and provide more exposure to the world. you might as well be making more contacts. keep in touch with them because if you want to be in film line, you need to make good connections (lots and lots). Perhaps it will lead your journey to become a successful film choreographer.
As a start you can join a dance academy nearby and get trained under a professional choreographer.
As per your interest you can go ahead and pursue a degree as well.
To get into film choreography you can participate in dance reality shows hosted by tv channels to get more exposure.
Keep practising and putting your dedication and hardwork and make sure to guide other also who are interested with a similar passion.