I got a Notice of Request to Vacate Suspended Prosecution in Arizona for a marijuana charge (one or two grams)

It is hard to say what a plea bargain would be as they are usually case specific. Also as you have stated this is in AZ and not in NV and I am unfamiliar with their AZ law. To answer your question about that a misdemeanor disposition is it means that they are charging it as a misdemeanor.

You should contact an attorney in Arizona who would be able to assist you in defending this matter. An attorney familiar with the Court and Prosecutors in the jurisdiction where you are charged are generally going to help you make the best out of an unfortunate situation. Many states are interested in having people charged for possession of small amounts of marijuana attend counseling classes, provide community service and pay small fines. Once again consult an attorney in Arizona who will be able to protect you and your families rights.