Hello,
As a beginner one can expect a salary anywhere between 20000 to 40,000. It all depends on your skills and capabilities. Once you have gained enough experience then you can even charge as per your will for each styling session.
Now talking aboout the job profile, a stylist is supposed to maintain a coordination between clothing, accesories and final looks. Its their reponsibilty to provide fashion advice, chosaing and coordinating outfits for models or specific clients.
Fashion stylists work for individuals, fashion houses and clothing brands. In the nutshell a stylist is responsible for creating style.
Good luck