Very strange summer this one !!!
After nearly one year of preparation for a trip in the Balcans, I'm now forced to completely review my "cycling" programs and that's why I'm asking your support.
Just yesterday I decided to anticipate a trip to Sweden where my son is living.
So I'll fly to Malmo next week and from there I'll go south till Italy where I'm living.
Now the question:
supposing to enter Germany from Flensburg (on the Danish border) and wishing to point south to Karlsruhe-Basel-Gotthard, which way do you suggest ?? Are there specific cycling paths to follow ??
Unfortunately I didn't have time to buy any guide but if you tell me the title I'll manage to enter the first bookshop in Flensburg and of course buy it.
I'm not interested to visit towns, I'm not even intersted to enter the big/huge urban areas of towns such as Hamburg, Frankfurt, etc.
I'm a bit afraid because such an area appears extremely difficult for cycling ... but I want to do it.

PLEASE, I URGENTLY NEED ANY TYPE OF GOOD SUGGESTION...

Thank you in advance.
Corrado