Hello Tax Experts, Need help!

I am working in the US with L2 + EAD since July 2012. I have following questions :

1. Under which category do I have to file the tax returns?

2. What's more beneficial- filing individually or together with my husband who is here with L1?

3. I have overheard it from somebody that if I am here as non resident I do not have to pay medicare and social security taxes (which are already been deducted from my salary ever month). Is this true?

4. Which forms I need to fill out?

Thank you very much for your help!

Redundant question.

You must pay FICA taxes and you file jointly.

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