I am in the process of obtaining that license too. The test, from what I read, is on the regulations in the sport your guiding in.. You need CPR which you get with ur 6 pack, and a physical which u need for your 6 pack. Onieda is a navigatable water so I think the 6 pack will work. Not many places you need a guides license for. Mostly finger lakes and adirodack lakes, and maybe chautaqua.
If you want to guide on Conesus or Honeoye you need to obtain another license from the state and have your boat inspected by the state. Total cost per year is $40. This is only for Conesus and Honeoye. If you have a 6 pack they will waive theis test.