However, if your really, really up for the challenge and you honestly think your fantasy idea is the right call for kids, i say go and get an agent, while working out all the kinks in your storyline. If that doesn't work you can always self publish or indy publish and hope for the best. A good way to get your idea known is to express it through open social networks like Facebook and twitter and blog the heck out of it. just a few thoughts.