What should i plead? underage and falsification?

I am 20 years old and I tried to get into a bar with my fake ID and the bouncer gave my ID to the police. The police tried to breathalyze me but the machine was not working properly, so the results came back as n/a. I got charged with underage consumption and falsification.What should i plead to both counts? what are the consequences im looking at?. I've already been through the diversion program once before for getting and underage consumption and the case is expunged from my record.