B-roads in Wales or Scotland?
Only joking, before I get accused of being irresponsible. Aside from PCGB track days (or others) where instruction is available, you might be better off without other cars.
I noticed Porsche offer training which is £299 (I think) and includes some on road and some off road (at an airfield or similar, not in a field!). This is one-2-one tuition. The only issue is that you will need to run the car in first, since you can hardly thrash it straight out of the box.
I' m considering it, since I want to find the limits in a safe place, at the least I think some time on a skid pan might be good fun (it' s too long to wait for the next snow fall).
The autobahn is of course another option for high speed runs, traffic permitting.
Rgds, Stuart.