My question involves criminal law for the state of: Arizona

I have no previous criminal record. I had a party with 10 people and the cops came. Everybody left except for 1 (who got caught) and blew a .01. I blew all zeros! I was still charged with minor in possession because beer was at the house. I was also charged with contributing to the delinquency of a minor because one person blew that .01. I am 18 so I am worried its going to be on my record forever. I have been researching and when I go to court I need to prove I am a good student and other stuff. I dont know how I should approach the court room, should I plead guilty, take a plea, try to get a diversion program. The diversion program sounds like the best idea but how do I go around asking for that. I am completely new to this whole situation so if you could give your opinion on how serious these charges are that would be great.