Handling and refuelling is best arranged through Donair I believe. Security have some funny ideas sometimes, it's worth checking with Donair what you'll need (if anything).
It's a fair walk to the track, even though Donair is at the right end of the airfield, so you might want to arrange a ride or taxi.
As a major freight hub and reasonably busy regional passenger airport, the airfield is as you might expect. Sometimes quite busy, but the controllers are usually very helpful.