I live in USA for 3 years. How can i get a green card?

You will need an employer or a qualifying family member who sponsors you. Depending on your counrty of origin you can also participate in the DV...

Can I still get my green card if I file for legal separation against my husband

You must live in a marital union to be granted a green card.

Can I apply L-1 visa in another consulate office in my home country?

You can apply at a different Consulate.

You must become a US citizen in order to petition for your parents. It will take three years from becoming a permenent resident before you can...

You state your current last name. There is another section that asks for other names you used. That is where you state your maiden name.

H-1B - consular processing petition pending (RFE status). Is it possible to convert it to an H-1B Change of Status petition?

Your employer can file an amended petition for you if you currently in status.

I have been searching for immigration forum but couldn't find anywhere, what website am i looking for and in what states? Thanks

You will not find answers online. Consult with an immigration attorney for a review of your conviction record and immigration history.

On my F2 visa, Immigration Officer wrote D/S. My visa expires in dec 2012. Do I need to apply for Extension of Status(Form I-539

No, you will be in status as long as you have a valid I-20.

Changing status from intern J1-visa, which Visa can I get?

Your question is too general to give you answers. All depends on the position that you are offered and your credentials. You will not be able to...

Do not have a birth certificate?

I agree with my colleague.