What are the documents required for persuing a MS program degree in US on L2 visa with a valid EAD?

None of the issues you raised are governed by this country's laws on immigration. Talk to a foreign student advisor at the colleage.

My understanding is that the 240 days apply to the H1B applicant's ability to work. Even after that, if the I 129 is timely filed and takes longer...

What is the impact on I-539 H4 extension if I don't join employer which processed my H1 transfer and H4 extension concurrently ?

If you do not start working for the now official H1B employer, you will fall out of status.

Options for H1B visa holder upon termination of employment

the new regulations are coming into town and will change the situation dramatically. Until then, termination of employment date is the same as...

Facing possible deportation because of felony charge

I would agree that the motion could be found on the grounds that there is a good reason to believe the criminal plea would be withdrawn.

I would like to know if it is possible to change the b2 visa to F1 while im inside the states or not ?

the process is known as change of status and can be accomplished in the USA before the current status expires.

I am U.S Citizen and want to marry a Argentinian. How does this process work?

You are correct in terms of the fiancee process if you saw the fiancee in person at least once in the last two years. You can also use the I -130...

After approval of PERM, can I continue to work on H1-B or live legally in the U.S. if the decision on I-140 in pending ?

You should become eligible for incremental one year extensions.

What do i do

You need to seek replacement of the card and you can apply for a fee waiver if you have no money for government fee.

If I am entering US on an I-visa for a foreign network, am I able to work for multiple foreign based employers once there?

I would agree that since the employer sponsored you, you only can work for that employer.