Can i file H4 extension without H1B receipt?

Lack of the receipt will result in delay.

Do I have to leave US if I get married to US Permanent Resident?

No, you don't need to leave the US if you use an experienced immigration attorney.

Will I be able to enter the US with my green card?

That is too much information and too many documents. Why didn't you file for a re-entry permit before you left? Talk to an attorney via Skype...

If you are outside of the US ... which your question implies ... you have no status and neither visa sticker will be invalid. BUT, once you...

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How many pay stubs did you submit? Did you also submit an employer letter? Did you submit W-2 forms?

Should I withdraw my K-1 visa application before or after submitting my adjustment of status?

We need more information. A k is filed when the fiancee is outside of the US. How did your (current) spouse enter the US? How long ago...

In my experience paper is always better. The CIS online form system is constantly breaking down. Keep a photocopy of everything you mail,...

Proof of current employment?

You need to be more specific as to what "stuff" you uploaded.

How will the new executive order effect my green card case?

Yes, unfortunately the EO will put your case on hold ... once they have completed the preliminary processing of the forms/documents.

Your facts are confusing. Consider a Skype consultation with an attorney ... having him/her review your PDF files.