Does the rate of "Green Card Applications/ total number of employees" affect the chances of getting approval on applications?

It depends on the amount of the increase. For example, if 80% of the employees are in H-1 status there is a very cumbersome H-1 process for H-1...

What do we need to do as my husband's 1 year extension for GC is about to expire in 2018 and 1-751 hasn't processed yet ?

Schedule an INFOPASS appointment with the Dallas Field Office in Irving. They will extend his pending 751 status for one more year.

Can we withdraw I-129 H-1B Petition which is already in "Department of State Sent Case to USCIS For Review" status?

That is very odd in that spouse should not have been given an H-4. Yes, you can withdraw the H-1 petition at anytime, for any or no reason.

Should we withdraw previous I-129 H-1B Petitions while withdrawing latest approved I-129 H-1B Petition?

You must either withdraw them or notify CIS the employee is not working for you.

Expired ID?

If you filed everything correctly, you should get work authorization about 90 days or so after filing, and an interview/decision about 8-10 months...

Can i get a green card if i been in the United States since i was six and being going to school ever since im 15 ?

Unfortunately, you need DACA to be reinstated to get work authorization. Legalizing your status will take immigration reform unless you marry a US...

It is very difficult to get an EB-1 Outstanding Researcher I-140 approved without three years of "outstanding" research after the Ph.D. The word...

My pastor's R1 visa was approved 2/01/2017 till 2019, do we have to wait to file an I-360 or wait for 2 years?

You can file the I-360 once the R-1 Pastor has completed two years of full-time employment as a Pastor, regardless of who the employer may have...

What visa do I need?

Unfortunately, despite what one of the other answers indicates, you cannot use a visitor's visa for any type of work. In fact, there is no visa...

Naturalization and marital union

That is certainly an exception to the cohabitation requirement. Good luck.