apple mail & address book

[michael Vogt]

I'm having terrible time sending out a e-mail that is a group  that has 
  a name like
RR sec 4&5    it has a bunch e-mails in the group  But it says that it 
can't send because it does not Recgnize  the email  name .
How do you set up a group then when you put in the address You use the 
first letter of the group so it will let you send it out

Im need  to get out some dos. right away to all the people in the group
Michael & Sharon  Vogt <><