Personally I consider TWRP the best. If you want to try Clockworkmod recovery, download it from that link. Install with Odin just like you would TWRP and root the same way. Whichever one you decide to use, after you get rooted, go back to recovery and make a backup. Very important to do that. If you ever have a problem, or you're trying a rom you don't like, you can just restore that backup.