Advice on planning a cycling tour from Amsterdam to Gothenburg?

I have about 10 days, maybe more. I need ideas for routes and things to do on the way. It's at the end of the month and I have, roughly mapped out a route from Amsterdam to Utrecht via Keukenhof, to Zwolle, Dersum, Wildeshausen and Bremen. From Bremen I would take a train to the Danish island where Copenhagen is, maybe I would take it all the way, depending on time, and then cycle to Helsingor to catch the ferry to Helsingborg and travel straight to Gothenburg via Halmstad or some someplace. Does anyone have any criticisms of this route and could anyone suggest places along it (or that I've excluded) that would be worth spending more time at and things I could do and see along the way? Primarily I'm trying to figure out how long to allow myself to get to the train station in Bremen. Perhaps it's worth nothing that I'm not particularly fit (above-average but my training has been derailed by illness and injury), nor accustomed to touring, navigating and camping. Thanks.