Hi
You don't say where you are, we live in North East Scotland, and it takes us 2 days to Dover and 2 back, only leaves 10, you need to see how the motor does on hills motorways and A & B roads, for ease of driving also mpg.
So may be Wales lake district or Scotland.
Camp sites and wild camping, see how you get on with wind and rain, and of course the sun.
Then their is tent, roof tent or inside your vehicle, how you are going to cook, their are a lot of ways and a lot of different cookers, gas, petrol, electric. Their is quite a lot to take in, I would suggest one forum to look on is
Free forum : 4x4's, Overland Travel, Off Road, Touring and Camping
I am biased, their are others.
Then do you plan to stay in one place for a day or two, or longer, above about the two weeks, if you are near the port of Dover, we once did what was called a Landy Rally, started in Holland then did 11 countries in 9 days.
see here
Home - Teddys
My opinion would be to do some trips in the UK first.
Best of luck on your travels, all you need is a sense of Adventure, and have fun.