How Many People Are Supouse To Be In The Wedding Party??

Okay so Im getting married Oct. 25, 2008 and Im starting the planning. Its my first wedding so I really don`t know much. Im trying to figure out who is supouse to be in my wedding party. I have 2 maids of honor, 3 brides maid, 1 flower girl, 1 ring boy. According to my cousing the ring boy goes with a girl they are supouse to symbolize the bride and groom younger?? so then I would have to get another girl?? This is a PUERTO RICAN wedding so I really don`t know!! Please help me!!