Drew Cutter wrote:
I've been looking at the Great lake kayak club. They give rating on
skill and difficulty. How does one build up their endurance for paddling
the great lakes ? Especially when the waters get rough and windy .

Paddle a lot. Seriously, it's he best training for paddling. If you
haven't done any skills training (strokes, bracing, rolling, rescues),
you should do so and get a solid foundation before you start paddling
big water.