My question involves criminal law for the state of: CA

Hello,
I was recently arrested for a warrant that was issued for my arrest, that I was not aware of, because I failed to appear in court following a conviction of a MIP. I was convicted of a MIP in 2003 ( I was 20 and convicted when I was a couple months past 21 ) I payed my fine but I know I was supposed to take an underage alcohol class and report back to court later, which I did not. Now the reason I blew this off was because when I called the court and looked it up online to find my court date there was no record of it or my case.
Now I have a new court date scheduled for next month ( 5 years later ). So my question to you is what can I expect from this?