sports nutrition online

I am a physical education teacher in one of the university here in our place. In order to update myself with what is new about sports diet or nutrition, I am planning to enroll in sports nutrition online. I don’t know how much it would cost to study online. I wonder what will be the requirements to be able to enroll. I still have to research about it in the internet tonight. If I will be able to finish this course it will surely help me in my line of work.