What Do I Do at an Underage Drinking Court Hearing

My question involves criminal law for the state of: ohio

I was issued a court summons for underage drinking and being publicly intoxicated. I violated section 4301.69(E)(1).
What steps should I take to prepare for my court hearing? Is there any way to have this expunged?

Read this and this.

You should consult a lawyer about how you might avoid a criminal conviction, such that you don't have to worry about expungement.