By now you should have studied race and class options in the player guides your teacher distributed to you. You may also use the following websites for additional information:
Races - http://www.wowwiki.com/Race
Classes - http://www.wowwiki.com/Class
This is a very important decision, because it will determine your path in Azeroth.
Once you have made your selection of race and class, start a new discussion to tell us what you've selected and why.