It is not a long walk. It starts at the Cafe. You can turn into Lake Barrington Road just south of Wilmot, or you can turn into Buxtons Road, a few Km north of WIlmot. The Cafe is on Lake Barrington Road just about at the intersection of these two roads.
The walk is an easy 35-45 minutes to the lower falls and about 15-20 minutes to the upper falls. As discussed
here, there should be other sets of falls further up the creek (probably private property). The last set of falls drop into the lake. You'd need a boat to see these properly.