When to file for adjustment of status?

Depends on whether you entered on a legal visa and whether your husband is a US citizen.

Do I need to go back to my home country to get my H1B visa so I can travel before my Oct 1 start date.

Legally you can travel. However, if you are on a OPT, the border officer may refuse you entry.

What are my options for obtaining a green card through self-petition given the circumstances described in the details:

You qualify for EB2 category, which is employer sponsored. Dont see how you will qualify for self sponsorship.

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Does time on L-2 or H-4 count towards 6 years h-1 ?

There is a "decoupling memo". Suggest you read it.

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My children are US Citizens, but they don't live in USA. Can I, as foreign parent with B1/B2, obtain a Green Card easily??

If kids do not qualify to sponsor, perhaps you will qualify for a work visa. I suggest you schedule a time to speak with an attorney who can go...

I`m a PT on h1b, planning to have EB2 sponsorship. What are the requirements for eb2? Does it need current visacreen to get GC?

yes you will need a visa screen.

Is there any lawyer in India to guide me on gc matter?

Feel free to call my office.

Can I apply for B2 Visa when my 6 years of H1B is expiring and GC- Perm is pending?

F1 might be a better idea.

Legal options to stay in the USA when PERM hasn't been filed yet and H1-B will expire 11/2/13.

F1s are taking 5+ months. File early. Also, doubt you will get the CPT from day one.

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PERM status change time reject to pending

Attorney can file the appeal, and write in his cover letter for the H1 that he has filed an appeal. By the time CIS sends the RFE on the H1, you...