First, the lawyer earns no interest. The check is placed in a trust account and any interest goes directly to the Mississippi bar to pay for legal aid.
As for the funds, it is not clear if there is chancery approval needed (which would be required for minor children) also there is an issue of Medicaid possibly having a lien or other medical providers. Please discuss this with your attorney
1. You were over the limit at 21, under 21 you were WAY over. The officer mis marking the ticket based on your age will not result in the offense being removed or in anyway dismissed.
2. Hire an attorney. You need representation. There might be technical issues with the stop or procedure OR there may be room for some very creative plea bargain
A shoplifting charge carries up to a 1000 dollar fine and up to six months. Your DUI is not relevant to the current charge. A shoplifting charge must be defended. You need an attorney. Depending on where you were arrested and what store is involved this charge can result in jail time.
I have defended these charges in the past and DAs and stores never just "drop them"
If the officer is not there at made the initial arrest, then the state will most likely ask for a continuance and usually get it. Being charged with paraphernalia in a vehicle is serious as well.
I recommend hiring an attorney rather than just hope there is an officer that does not show and the court dismisses .
You need someone to look at all aspects of this case, evaluate probable cause, the gathering of facts etc.