Hope you enjoy your seasonal pitch, Colin. It's been a revelation to us and a much more relaxed way of enjoying caravanning. No more hunting for good pitches, no setting up, towing just twice a year (there and back!), arrive when you like, and leave when you like. You'll probably find you'll use the van much more than many others as it's so easy to get going. We arrive early Friday and leave at 5 am Monday (!)and we don't miss many weekends. Fantastic escape.
For pegging, use long rock pegs and smash 'em in with a club hammer. Don't forget to have a strong tie-down kit for the awning as well, because you may be away during bad weather.
Under foot, we use a double layer of ground sheet, a breathable sheet and a cheap cut-off of lino, which is brilliant. You really can't have too much, but you can justify the extra bulk because you're not towing very often (we have storage box, fridge and a small patio heater in our gear!)
Enjoy it...