I think you should do a bit of research before making your plans. First, this year's tournament is 3v3 only. Second, there is a registration fee of $20 per account. Third, you don't copy your characters. You are allowed to make 3 characters on each account and you are allowed to choose any class.

All of this information can be found at http://www.worldofwarcraft.com/pvp/tournament/faq.xml