If you join Dewsbury they compete in the same cross country league as us (Baildon). There are 5 races and it's great fun. You'll have to be quick though, starts soon!
On the other hand if you're not bothered about XC then try as many clubs as possible and as Podro says there are loads. Then join the one you like the best. Most will lert you go out with them a few times before deciding.