I'm on OPT with a valid EAD. Can I continue to use my current EAD while my I-485 is pending? Or do I have to wait until new one?

You are authorized to work until expiration of your present EAD.

Can a person travel to his country during the Visa conversion period (H4 to H1B)?

This would not affect the petition but she might like to plan in better ways if she desires.

I want to apply for naturalization on basic of marriage to U.S citizen at least three years, are this documents enough to send ?

If USCIS needs more they will ask for. It is difficult to say whether this is all you need which is mostly determined by your personal...

What document i send with form N-400 application for naturalization ?

You should have followed the instructions to the form for what documents should accompany the Form. USCIS requires you establish your eligibility...

Is it unlawful to switch visa status while in the US and then get married?

Marriage should not cause a problem for present.

Immigration: H1-B work visa related consultation

Your new employer can help resolve it but it would cost them some more. So... If you leave you can return with a visa when new H1 is approved.

Not sure how the facts work in this situation without knowing more because I can imagine when it "could" and also "should not" affect her. Please...

What is the process to recieve my Green Card? Deffered Action, Married.

Prior Deportation does not affect deferred action but it can affect your greencard process. You are better off seeking a private consult with all...

Investor visa?

There are a few possibilities and you should be willing to consider them all before taking a decision. Since you would like to risk your $$$ (that...

visa application with this reason are mostly unsuccessful.