You'll need to check each country's requirements for compulsory equipment i.e. fire extinguisher, high visibility vests, spare bulb kit, first aid kit etc.
There are highway tolls in Switzerland, Austria and the Czech Republic, although usually there's an opportunity to buy a vignette at the border (either from an official kiosk or petrol station).
Some tunnels in Austria may have additional toll charges, although I think a couple are already included in the Swiss toll charge.
Luckily Germany is toll-free on the autobahns
You'll need to get a green card sorted too for insurance purposes. And, if you have an older UK licence without your photo on it, you'll also need an International Driving Permit for the Czech Republic. Not sure about Switzerland as I can't recall if they are signatories to the convention that covers it.
I think all the other EU countries that you're going to accept just a European Communities model licence.