Is it okay for my father to leave the states after the approval of my IV visa or should he wait until I receive my green card ?

Once you enter the United States and get an I-551 stamp (temporary green card) then it would be safe for him to leave the U.S. I wouldn't advise...

I am currently on H1 planning to file COS to H4 soon. Can I file H4 EAD while COS to H4 is pending/before H4 approval

You can file Form I-539 to change your status and Form I-765 for employment authorization at the same time.

What is the next step after receiving interview letter from NVC so my children can be at the interview with me under the CSPA?

You absolutely need to have an attorney review your documents and make contact with the NVC and consulate if you want to ensure you are eligible...

Pls help!! while filling my H4 EAD form i 765, should i fill my current h1b i 94 no or future?

Use your information for you H-4 status beginning in October 2015. The EAD will be connected to that status, not your current one.

N400

Whoa! You need to speak to an immigration attorney as soon as possible to deal with your removal proceeding so that you can (if eligible)...

How many days after....

One can only speculate how long it will take to review. The status should update within a week or so, but review could take a month or two.

If you were indeed cited by a law enforcement officer at the scene of the accident then you should say yes, but if you feel like you want to...

You are cap exempt for 6 years and do not need OPT. Where is the F-1 coming into the picture? If you are on F-1 now, yes you can change your status...

I have an approved i-130 and they aren't visa numbers aviliable and ny husband awaits an appointment for his naturalization .

Is your husband naturalizing and then filing an I-130 for you? You should contact an attorney to prepare the forms now, then you can file them...

Asylum and EAD Clock.

1. They can petition for you if you maintain status but you will have to wait until a visa is available - and the wait for siblings is 10 years....