At the age of 14 job opportunities are still limited, but you are allowed to work.  Federal age requirements for jobs can be found at the  U.S. Department of Labor web site .

Arizona also has statutes regulating work for those under 16 - (for example you have restrictions with working in manufacturing and in a pit with a bull)

23-232. Prohibited employments of persons under the age of sixteen

Arizona also has statutes regulating work for those under 18 (for example, you don't get to work with explosives)

23-231. Prohibited employments of persons under the age of eighteen