Steve,
I have been fishing Lake Erie for many years out of a 15′ boat. The Sylvan that you have will work just fine providing that watch the weather. Erie can kick up in a hurry and if you are caught off guard, it can be a very hairy ride back in. Jason is right about a radio, I have a hand held Humminbird that I keep in the boat and turned on the whole time I’m out. It’s not so much for talking, but more for the weather reports.
My rule of thumb is I really don’t venture out more than about 4 or 5 miles from shore. On Lake Erie a South wind is safest unless it’s really howling and you can pretty much fish any where you want. West winds aren’t too bad as long as they are under 20mph. North and East winds are usually pretty ugly.
If the fish aren’t biting in the Sandusky Bay area you can always ferry your boat over to Kelly’s Island and fish over there. The Smallmouth should be real hungry at that time of year. I hope this helped you out.
Wes