The processing times for Adjustment of status is about 1 year. It could be more depending on service center you case will go to. If you are already...

Talk to an immigration attorney and have them advise you how to proceed.

You can. However, you'll need to show why you are self petitioning with documentary evidence. I recommend hiring an attorney to see how to proceed.

You certainly can. Your Change of status will not take affect till your application is approved.

If your green card application is pending, there should be no fees for I-765.

Your interview is going to be scheduled at a USCIS office in the city where you live. If you want your attorney to accompany you to the interview,...

Technically she can but I would not recommend it. I would talk to an immigration attorney to see the pros and cons of quitting school before you...

The minor should be fine. The mother might need to apply for a returning resident visa before she can come back.

You can apply for both the same time. If there are any fees, they can be paid vis checks, cashier check, money order etc.

Processing times are longer right now. Assuming you received the receipt notices, the biometrics should follow.