Jono you will be fine.A very wise old friend of mine(a lot older than me) once said to me a caravan is just somewere to sleep whilst on holiday.You are out most of the day doing nice things.Most of the time you will eat out or barbaque except maybe for breakfast.Most sites have decent washing facilitys.
You might want to start with a basic porch awning,two water containers(clean and dirty),maybe a small tv,some utensils,a spare wheel,decent new tyres to start with and some sort of stabiliser etc.The van may come with some kit or get some thrown in.It is quite cheap to set up.But dont worry about the towing,stick to 50mph till your happy and confident.
Ive said it before and i,ll say it again.Your on holiday,it doesnt matter how long it takes to get to your choosen place.Enjoy man.