I'd say get yourself pitched in Great Plains, which is anywhere in front of you just to your right or left as you go in. Nice distance from the arena but not too chaotic.
It's not crazily big, but a good idea would be to do a lap of the place first time you go in on Friday, as you can circle round the place to get a good lay of the land, with the main stage being at the centre of the thing. Maybe stick to your left as you go in, past Chai Wallahs, to the real ale bar, or the wines of Argentina bar, whatever takes your fancy, grab a drink, then double back on yourself, go uphill, into the woods, all the way round, back down the slope on the other side, then eventually through to see whoever happens to be on the main stage!
So that's the pink line on this map, if that sounds a good idea, all the while popping to any venue, or bar, that seems interesting! You'll soon get a hang of the place. One of the more unique things is that the Tim Peaks venue is a permanent structure, a deer shed for the deer farm! It can be a place early on to chill out, feel a bit civilised and get a nice coffee, or somewhere to dance on the chairs to later on!