Classes fill very, VERY quickly so sign up ASAP. In NJ, go to www.njrefs.com and click the top tab "BECOMING A REFEREE." The first set of 4 classes closed out already. An additional class was posted on 7/24 and will likely close out within the week - it will be held 8/23 in Edison - this is the in person date; you must complete online portions by a specified prior date. Again, these classes fill VERY quickly.
Classes in NY are listed here.