You can usually play volley ball for the school, but if you want to play outside of school, you may have troubles finding a league to play for. There are probably a couple leagues at least in Arizona to play in, but how close to the city you're in will vary. If you really wanted to play, you could drive the extra distance to go there or you may have to convince your parents to take you if you can't drive.
To find volleyball leagues in Arizona or any place really, simply look in the newspaper, watch for flyers at school or posted around the city. When looking for volleyball leagues in Arizona, you can go to a website, VolleyballArizona.Org and it will provide you with leagues, places to play, etc. It should be very helpful, but it may have a city near you or not so you'll just have to look extra carefully.
However, if you can't find volleyball leagues in Arizona, and you don't want to try another sport or drive, you need to keep your skills up for the following school year. You could do some volleyball drills if you had the place for it and if you were a setter, you may want to try going to some volleyball setter camps on the off season.