Very nice ride, my wife and I have done it several times (check out our page below) but starting at Cologne and heading south.
The whole route is signposted you really don't need a map and there are many campings along the way, if you're camping that is.
In Switzerland there are cycling routes to just about everywhere you want to go, just step into any tourist office for more free information.
Be carefull of the camping in Switzerland they are expensive, we paid €30 last year just north of Basel.
cheers