Can I go to jail if my drug test are clean but I don't pay the fees and haven't gone to the classes they want me to go to?

Possibly. They cannot revoke your probation if you are UNABLE to pay fines or cost. They would normally have to show you are capable of paying...

You can do anything pro bono that an attorney can do. Of course the problem is that you probably do not have the expertise or experience to...

Yes. Creatine levels below 20 will result in a dilluted UA.

He is eligible, but normally it largely depends on many factors, including the DA, Judge, and the victim.