My question involves criminal records for the state of: Florida

How can I go about in my arraignment in court in two weeks to help have my case expunged in the future? The arrest was for petty theft, first offense misdemeanor, just turned 18, orange county state of florida. I will not have a lawyer as I am a dependent student, and my parents have not found out. I will go to court by myself.

I hope you can realize that this is extremely important to me. I am in hopes of becoming a doctor in the future, and I know for a fact that after you are offered admission to medical school, the official licensing(MD) school must do an official, and pretty thorough background check on you. This misdemeanor will definitely haunt me, so I am trying to do whatever it takes to have this case dismissed and/or expunged. If I get the pretrial diversion program(frequent for first offenders petty theft), can it be expunged once I complete it, or only sealed? What other consequences can I expect to face? I will NOT plead guilty.