Pendragon series
Bobby Pendragon is a normal 14 year old ... or is he? Circumstances push him into out-of-this-world adventures that require him to square off with a villain named Saint Dane who is anything but a saint. Can Bobby save another world from the evil that threatens it? Read to find out.
Also, look at the Pendragon website at: http://djmachalebooks.com/books/pendragon/