very little prep needed, check the amount of brake pad material and all the fluid levels when you start the day and again at lunchtime, and keep an eye on the tyre pressures. if its a dry day then the pressure will likely go up 5psi as the tyres heat up, so i'd start the day at 33psi, do a few sessions to get heat in the tyres, then drop them down to 35psi hot.
Oulton is a long lap, so i'd be limiting yourself to probably at most 6 laps at a time, then come in. Also, as with every car and every trackday, make sure you do a decent cooldown lap (trying to use brakes as little as possible) at the end of every session - your car will thank you for it. And don't put the handbrake on in the pits!
We're off to oulton in 3 weeks time - it'll be our second time there, hopefully weather conditions will be better this time around!