Getting there
The best way to get there is undoubtedly to fly to Amsterdam then get the train. You can fly from Leeds-Bradford with:

Places to stay
Grand Hotel Central (not cheap, but near the station)

Amsterdam hotels

Guides, etc
Rough Guides
Rough Guides guide to Amsterdam (click on Amsterdam under Featured Cities)

The ground is quite a way out from the city centre, although the transport options are pretty good. You can get a tram, or alternatively there's a train station next to the ground. Click here for a site about the ground, including instructions on how to get there. There's a map here