hello, welcome to our little corner of the world
the two main showing organisations are the GCCF & TICA. depending which your cat is registered with, will be who you can show them with but you can register with both if you wish.
to start off it would be best to ask her breeder for details of her registration if you don't understand, but if that doesn't help feel free to shout here & we'll help you out.
as you've joined the BCCGB, who are affiliated to TICA, this link may help you get an idea how to start out with their shows...
http://www.tica-uk.org.uk/html/how_to_show.html
also, as already said, there are a few threads in the showing section on this forum with advice.
another idea would be to go along to a show as a spectator to get an idea of what's involved & speak to people there, to get a better feel for it before you take the plunge. the BCCGB have their club show on the 8th march in bracknell, berkshire...it would be a great place to start
have a look at the show flyer here for details
http://web.ukonline.co.uk/bramblewoodbe ... page_2.htm
if you're still confused, don't be afraid to ask...we're a friendly bunch & will be happy to guide you through it the best we can.