Do you have his receipt or the receipt number? If so, you can check the case status online. If you wish to withdraw from the case, you would mail...

Unfortunately no, that is not how the system works.

You could apply for another type of visa if you qualified or a student visa. As for the B2 you do not have any options.

You can reapply immediately. Just because your first case didnt work, doesnt mean you cant try again.

If your priority date has not become current, then you can use the approved I-140 for additional H1b either with the same company or a different one.

Sorry, you need to provide more information. If your I-485 is pending, then you can also request I-765 work authorisation.

Put in a service request online for it to be resent. https://egov.uscis.gov/e-request/Intro.do

There is no way you'd get the STEM OPT card before the marriage one, so doesnt really matter. But you could if you wanted to spend the money apply...

For the affidavit of support, you would need to make about 23K a year if it was just the two of you. https://www.uscis.gov/i-864p

Initial permission. It says I need more characters...