I fell in love with a US citizen and we want to get married.

If you entered with a visa, you can probably do everything here, marraige and adjustment of status to permanent residence.

Citizenship application and Tax Returns

In my district, you must show copies of your last 5 returns or a tax transcript for the past 5 years.

Transfer from H4 visa to A2

The only thing is that if the A2 allows for diplomatic immunity, then you will have to waive that immunity once you seek permanent residence.

Can I apply for EAD now or wait till L1 extension ?

You should have a lawyer review the documents. If your husband's status is based on Petition Expiration Date (PED), it might be worth waiting for...

Applying for PERM in 6th year of H1B

File a new PERM and look into recapturing time on your H-1B.

Im an immigrant and i dont have the legal documentation, i live with my kid's father who is a US citizen

You may be eligible to apply for permanent residence under the Violence Against Women Act, which protects you from mental abuse as well as physical...

Do my sister have to provide copies of my and my sisters birth certificates if shes a u.s citizen? She is petitioning for her h

Not unless you are a co-sponsor.

Yes, he would go to Mexico for the interview unless he is 245(i) eligible or overstayed a visa.

Have 6 years work experience before relevant Bachelor Degree of 2 years. Am I still eligible for H1B?

That is true for labor certification, but it should not be a problem for obtaining a degree equivaency for use in an H-1B application.

If I am a canadien national and legally entered through Canada

The initial E has to be applied for at the U.S. Consulate in Canada.