What happens after the interview for the green card?

So far it is good. Make the inquiry after 30 days. You may get the decision sooner though.

My tourist visa was expired and i overstayed.now i am married to a US citizen.i will be able to get green card

You can get your green card. File the petition and adjustment application together but talk with an attorney first.

Can I apply for Adjustment of Status and/or Employment authorization if I am in gay marriage with US citizen?

If you have entered the US with permission and do marry a US citizen you can apply. Expect lengthy delays and be prepared to sue the government.

How many days to get a response after RFE request document has been submitted?

Once you have taken and passed the examination, immigration must issue a decision within 120 days.

Can an asylum seeker with EAD apply for scholarship/grant for research purpose in the US?

Yes you can apply but whether you receive the grant depends on the rules of the institution providing the funds.

I was an international student here since 2006. Would I qualify for the immigration reform?

There is no reform yet. Stay tuned for news,

My husband is in mexico and he got approved for his i601 wavier can he come home now

He needs an interview at the US consulate.

Do I need an immigration lawyer?

It would be helpful to know what the conviction was for. Typically when a person is deported he or she must stay out of the US for a period of ten...

My husband file for me under my married name but my passport has both my maiden and married name will that be a problem ?

No that will not be a problem.

Yes disclose everything and provided proof you completed the penalty and paid the fines.