There are two issues here. The Visa has been an obstacle for many of my Non-US resident clients. So, I'm not going to address that here, because until you have a work Visa, you can't work. Therefore, I'll answer the predominant question: Who to contact.
There are different types of producers in television. For example: Line producers who are dealing with the actual day to day of production and co-producers which I just chose as an example of one of the many titles used for the writers of the show. Because I don't know which path you're headed, if you wanted to write, you'd most likely start out as a writer's assistant. If you wanted to be in physical production you'd most likely start out as a P.A.
Who do you contact? EVERYONE you know. You tell them your goal (ex: to get a tv PA job or a tv writers assistant position) and ask if they can help you or refer you to someone who can.
That's where you start. Past that gets too detailed for a handwritten answer, although if you are brave enough to read through the 738 questions that came before this, you will find many helpful blog entries. Good luck!
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