There was a book that I read many years ago about a kid who was a servant to people who trained and faught dragons in an arena. He found a dragon and began to train it. That's all I remember about the book. If you know what it is please let me know! I would like to get this book. I found it once on here but I can't remember the name to find it again. I appreciate it! 

My first thought is that it might be Dragon's Blood by Jane Yolen?

It definitely sounds like a fantasy series, so although it's young adult, you might want to post in the Fantasy thread as well.  Hope you find out which book it is.