Can I move out at 18, even though i'll still be in school?

At 18, you are an adult and can make your own decisions absent a guardianship.

How should I defend myself against my criminal charges if I'm the co-defanent

You need a lawyer. You will not like the results if you represent yourself.

Your situation is unique and complex. You need to get a child support lawyer.

Do I have to have my mother's consent to go to a psychiatrist?

You are a minor. They will not see you or prescribe medicine without parental consent.

Will they take me to jail if I go to court tomorrow

It's possible but not very likely to happen. Try to work out a payment plan on the warrants.

Can I be garnished a 3rd time?

Yes. You need to file an action here before Texas gains jurisdiction. You certainly can have 3 garmishments.

Could I have violated the grounds of my probation

It depends on whether a condition of your probation was that you not violate any traffic laws. Check your paperwork.

I was arrested almost 9 years ago for a dui my job is putting me on their car insurance is it going to show up in the backgroun

An arrest is not a conviction. An arrest record and conviction record ar different.

What charges if any can come from this?

It sounds like a scam. Don't pay anyone any money unless it's an attorney to represent you.

The judge can do whatever he or she wants. You should have waited to smoke AFTER your court date. Maybe you will get lucky and escape the test....