In need of a little advice/help.

I'm in the early stages of planning a 2016 European trip.
Basically me and the wife want to do Berlin to Munich campervan style, visiting Leipzig, Prague and Salzburg on the way and giving myself 10-12 days for that stretch of the trip.
So that said I just wanted to know if anyone has done something similar, if 10-12days would be long enough and if anyone has any idea on what to expect driving that distance and camping in the van?

After that we'll probably head to Barcelona, Ireland and Edinburgh.
Has anyone traveled directly from Munich to Barcelona? Was thinking train for that stretch.
Any suggestions for Ireland, will only have about 6-8 day's before finishing up in Edinburgh.
Lastly what is likelihood of getting a flight home from Edinburgh? Will I have to fly out of Manchester or Heathrow?