I got call for my fingure print at USCIS after filling I-485. What will be next procedures or process to get my green card?

Depends on the basis for the I-485.

Can we get married while I am on student visa or should we apply for K1?

When and where you get married is entirely up to you. You cannot immigrate until you have fulfilled the foreign residency requirement.

Trying to cover up for rear ending an uninsured driver.

It clearly was not a hit and run as you exchanged information.

My brother was given his courts summons at a Del Taco. Does these mean he has been properly served?

Yes

Is it legal to take a viedeo of a underage child and post it on youtube

Not illegal based on your facts.

The plaintiff is 100% likely to show up, as the plaintiff is the State and is represented by the DA.

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Can and how the uscis 797D mailer notice that came with my greencard be of help now in processing my I-90 for GC renewal?

The mailer is irrelevant to the I-90.

L1-B Changing from One location to Other in Same company Company.

Your employer needs to retain an experienced immigration lawyer to review all the facts, advise them, and handle the case. Your employer can find...

I hold valid 5 year multiple B1/B2 visa. Can I travel to US, while my J2 is still under process.

Entering the US with one visa with the intend of filing for a change of status would be considered visa fraud.

You must answer all questions on the form fully and truthfully.