Depends on what your immigration status is.

I have applied for L2 EAD and got a RFE asking for Your relationship with the principal applicant( marriage or birth )

Your choice.

H1 approved while H4 is still in 'Initial Review'

To be on H-1B status, she must have H-4 status through at least September 30th. Your employer needs to retain an experienced immigration lawyer...

Is there enough time to start the GC process and still be in valid work status? OR should i just extend the H1B again?

Unknown. It depends on what the Department of Labor does, and what the priority dates do. Your employer needs to retain an experienced...

Can I ask L-1 valid period starting 6 months later or even more?

6 months prior to intended start date is the maximum. The Court of Appeals for the Seventh Circuit recently stated: "The Immigration and...

DS160 form filling for dependents

Yes. The Court of Appeals for the Seventh Circuit recently stated: "The Immigration and Nationality Act is a bit of a beast. It is not known for...

What's the average processing time for NVC to schedule an interview in Ciudad Juarez?

A couple months.

Does it matter which airport I enter with my J1 visa? (Immigration-wise)

No

Can I get CPT for an online/distance education?

No

I and my kid are here in the US with B1,B2 visa and i like to change my status to R1 visa. what documents do i need to apply?

The church petitioning you needs to retain an experienced immigration attorney to handle the process. It is not easy.