Am I wrong in my understanding that in order to call state, regional or national ASA tourneys, umpires MUST go to an ASA clinic?
Clinics, National Umpire Schools and advanced camps are never a bad idea. If you want to truly be effective, you must recognize that you must grow as an umpire. I'm in my 16th year (the first half of which were easily "rookie years"), and I'm still learning, still undoing bad habits and techniques.
However, the fact that you're here on this forum is a good step. I've been on this forum for almost exactly a year, and I wish this forum had existed when I first put on the uniform! It would've saved me a lot of grief.