Am I legally to do stock trading on H1-B Visa?

Yes

Can I change my status from a B-2 visa to an L-2 visa without going back to China? Is this allowed in the immigration law?

I agree with my colleagues. You can, though it is best to retain an attorney to represent you.

I've my H1b extension valid from 06/15/2013 and if I go for stamping, do I get stamping on my extension or current petition?

Visa is a travel document. As long as you have an approved petition, you can seek visa for that period to enable you to travel to the U.S.

Do I have to notify USCIS about this

It depends. You are to show residency for at least 3 months in the jurisdiction you apply.

With my 10 year green card can I live in another country and still receive US citizenship?

Once you apply and get approved for GC you are to maintain your residency. If you leave for long periods you will be considered to have abandoned...

So is it possible to submit the 9089 form with my old I-94 information now? Yes. It is current information while you stay in the U.S. Can we...

Am on L2 visa and EAD and work in Public School under County School Corp. My emp. wants to apply for my GC. What docs do I need?

Since the employer starts the process, it is best to seek referrals for a good attorney and seek his/ her representation towards the process. An...

Can my new husband from England stay here on his Esta Visa while waiting for green card?

Talk to an experienced immigration attorney before you file.

Form I-797C appointment for Biometrics. receive two mails one after another. appointment dates and time is the same on both mail

Keep the appointment for the fingerprints. They will take the photos too. If you cannot make it, write to postpone the appointment.

Family Name on Immigration Forms I-130, I-485?

Whether to continue to use maiden name after marriage or to take husband's last name is a personal choice. Name change hardly has any affect the...