I have only ever been to Hereford to watch a football match. I went to watch Hereford United play Wolverhampton Wanderers in an FA Cup match. From what I remember Wolverhampton won.
The one thing that sticks in my mind is Herefords tradition of parading a bull around the pitch before the match as it`s their mascot. To watch the match the only equipment you really need is a good strong voice to sing your club`s songs and encourage the team and your eyes to actually watch the game, some people do take a pair of binoculars if they sit far from the pitch.
Apart from the above the club s encourage you to buy their merchandise to enhance your matchday experience, you can buy virtually anything from hats and scarfs to the full blown replica kit, which generally is updated annually.