How long do we have to wait for a background check to get approved on his legal adjustment status?

The background check can take weeks to several months depending on the case. If you have counsel please discuss with them regarding the same.

What must I do if I began a the form i-130 from USA and I included my wife and son but I need to include another person?

We need more information. Are you a US citizen or a LPR? What is the status of the I130? Is it approved? Thanks

Do i need a lawyer for a speeding ticket 75 over 45 with child on board?

This is really not an immigration related question. Please talk to a licensed attorney in your state who handles speeding ticket matter/criminal...

Do I need to attach my tax returns or affidavit of support for a fiancé visa when I file the petition ?

I would highly suggest consulting with an immigration attorney. Basic errors can lead to significant delays.

Is it possible to change locations?

One cannot enter on a tourist visa to adjust status. Please talk to an immigration attorney.

Does uscis going to reschedule my n-400 interview or not?

If a N400 interview is set, you should attend it. USCIS can make a decision on the I751 and N400.

What kinds of visa can I apply for?

To be honest you need to sit down or do a skype consult regarding your options and eligibility for the O visa. The online forum is not the best...

The UN is not regulated by US state or federal regulations.

N-400 Application rejected?

Make sure the filing fee is correct. You can pay the filing fee via credit card. Look at form G-1450 which would need to be completed. Maybe a...

Can I petition my biological mother to come in the USA as a permanent resident?

This will not be an option available here.