You could also launch at Catawba State Park. For perch I would head west towards the firing range. Have a chart so you stay out of the closed zone. You could also head north toward Rattlesnake island for perch. as far as walleye that's a tough one. Not many good walleye reports within close proximity to Port Clinton lately. Little fishing pressure for them and the few being caught are farther north in Canadian waters or further east in the central basin.
I would suggest you make your first stop one of the tackle stores in Port Clinton for up to date info and a supply of tackle. One suggestion is Fishermen's Wharf in downtown Port Clinton. There are many others in the area.