Get yourself a good book either on the breed that includes showing or one on showing in the UK. Their are loads on amazon. Next thing would be to contact the kennel club for ringcraft clubs in your area, I am sure there is one as they are everywhere. Then maybe look up breed clubs for your breed, the people in these clubs will be the most help to you and you will probably find your breeder is a member of at least one of them.
Hopefully that should set you on your way. Showing is great fun, I highly recommend it.
Link for info on starting showing
http://www.thekennelclub.org.uk/item/265Contact form at bottom of this link page to contact KC for ringcraft info
http://www.thekennelclub.org.uk/about/contact_us.html Just select information services when sending
Emma