[tevake]

Plenty of good comments so far. I especially agree with Notfarnow, about dingy sailing as a good starting point.
The Oday 17 seems to be a good design. Uffa Fox was the master, and did many classic designs.
So for your thinking for tomorrow. How many do you plan to sail with? Is it big enough? Are you going to be trailering? Does it have a good trailer? What is the condition of the boat? really check out the seats and floor if they are glass over plywood. Is there a good outboard engine. How is the hardware, rudder, centerboard? Mast, boom, and rigging? I would think that sails for a class boat like this should be quite reasonable. Are there other boats around to compare?
This looks like a fun boat. the cuddy cabin would carry a cooler, or a little camping gear for some fun outings.
Let us know how it works out.
Oh, I sailed up and down the Hawaiian chain for years on my 25' sloop w/o an engine. Good fun, and good learning.

Cheers Richard