GPTassie

Hi all,
I have big plans to travel Europe for 7 weeks starting around mid June, being guided around via F1 and MotoGP races.
The F1 races I'm looking to go to are Valencia, Silverstone, Hockenheim, and Hungaroring GP's.
So I guess I'm looking for any tips regarding these events.

Can I get multiple event tickets?
If only single event tickets, are the top price tickets worth it?
Is there any sort of tourist tour that follows the GP's?
Should I bother to go to practice day, or just qualify and race days?
Better to book ticket and accommodation packages?
Best place to book tickets?

Sorry for the list, but hopefully you can get a picture of the sort of info. I'm chasing.
I've done some research on the web, but it's fairly daunting looking at 7 events on 7 concurrent weekends involving 6 countries.

If anyone can be bothered to give me any pointers it would be greatly appreciated.
Cheers.