Can I continue to Work on L2 + EAD, even when my spouse holding L1B visa returns to home country for 6-8 months and will return?

Yes and yes

How long it takes usually to get the green card after marriage to usc ?

My experience is about six months for your first question and about 90 days for your second question. Good luck!

How do I change my name with uscis? I already sent the forms to adjust my status and I used my maiden name.

From my experience, when you go to your adjustment if status interview the official will usually ask you if you want to change your last name or...

Proof of residence for citizenship

Yes

My L1 B expires sep13, I will be applying for an L1 A since iam a manager now, I have the following doubts:

You should schedule a consultation with an attorney.

Getting my grandfather and his two ill children from Mexico to the US

Does your grandfather have any US citizen sons or daughter in the US? Or do any if your uncles? Also it would help if they currently have or can...

I need to know what was a judge decision on a court hearing that my wife did not attend in the year 2000 in Los Angeles ?

File a FOIA requesting her file. It's free.

How will my visa be affected by the fact that my mother is living in the US illegally? Could this lead to her deportation?

You must be truthful. It is not likely your mom will be deported as that would involve the department if state sharing information with ICE, which...

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H1B Transfer to my own company

You cannot legally work for both companies and as an owner of the company you cannot petition for yourself as an H1B employee. Please consult with...

Have applied for Change of STatus from B1 to F1, school starts day after. Since decision is pending have shifted to July Session

You should be ok. Usually schools are pretty good about guiding students through the process. Just make sure you don't leave the country until you...