The J-3 Cub is basically a trainer that's converted into a taildragger. I personally, would not recommend it for a first plane because of this. They'll nose over on ya and they can be tricky to keep on the ground when landing. Go for a good ol' Hobbico Avistar trainer, or any other trainer that offers a nosegear. You'll be much happier with that to start with. Just my opinion.
Clinton