Question about Goblet of Fire

Rating: Null/10 (26 March 2006)

I'm hoping one of you can help explain a few things. I have read the books but still...I'm a little confused. If this has already been discussed, I apologize for annoying you.
What was the point of letting Harry compete in the Triwizard Tournament in the first place? I mean... Voldemort didn't want him killed right away until he grew stronger, right? So they could have that climactic scene in the end? But Harry could have been killed during the actual tournament. Dumbledore himself has said that many people in the past have died competing. Couldn't they have just let Harry be, and waited until Voldemort was stronger and then just snatch Harry from wherever he was? To perform that spell that brought Voldy back 100%? Also...I'm looking for a complete definition of a death eater for my little brother. Can you tell me where to go? Thanks!!