Very Urgent:Need Help with L2 and H1 confusion

[toctic]

Hi,
My husband recently moved to US on L1 . I have got a L2 visa now and presently in India and working in IT field. Now my question /confusion is, I want to apply for H1 in 2006's quota. Is it better to apply from India or from US. If I apply from India and enter US through L2 will it become a problem? For H1 stamping after october , can I come to India during some vacation say in apr or may 2007 and get stamped or I have to come back to India immediately in october to get stamped? Please advise.
Has anybody worked on L2 visa with EAD? Is there any discrimination made by companises between a EAD candidate and a H1 candidate?

 

[GotPR?]

If you apply for H1 anywhere other than the US, you need to have H1 stamp before you start working.
If you apply for H1 in the US(provided you have valid L2 status), you can apply it with I539. If I539 was approved as well as H1, you do not need to get H1 stamp in Oct before working, however, next time you travel after Oct , you need to get H1 stamp to enter the US.

 

[toctic]

What is this I539 for ? Is this some kind of a work permit?
Can you shed some light on how to apply for H1 along with this I539 form.
Suppose I enter US through L2(after applying for H1 from India) and obtain EAD in the US , can I start working with EAD before october when H1 approval comes through and later on shift to H1 status when I get stamping in India?