You can take the certification test anytime, just send in your money and you'll get the books and test back to take. Honestly, anyone can get certified, but a good association leader won't throw you to he wolves your first time out. As for training, TSSAA holds a camp every January. If you really want to start, get with your local association and do some summer ball. You don't have to be certified and there is less pressure on a rookie umpire.