Hello Helen and welcome on here
I am another "beginner", in that I have only shown a couple of times at GCCF shows but I have attended a TICA show and it is much better in my humble opinion because with TICA, not only can you stay in the hall with your cat at all times and for as long as you wish, but you can bring your own cat to the show ring. With GCCF, they tell everyone to leave the hall during the morning between penning and lunchtime and only when the public are allowed in can exhibitors come and attend to their fur-kids. Also, TICA judges comment as they are judging in the show ring and you can hear what they say about your cat whereas GCCF judges do so on a little wheeled trolly which they take from pen to pen and you cannot tell what they think of your cat unless you find a judge who is willing to tell you. There are others who can tell you far more about the details of showing, how to enter a show and how to find out about where they are happening etc. I suggest visiting one or two sites and checking out some dates. I take it that your breeder has said it would be fine to show or perhaps you are considering showing your cat as a pet? Whichever governing body you choose, there is a category for household pets. With TICA, I know that you can enter a show without being a member of any club just to find out what its like.
Have a peep on here, for
TICA and here for
GCCF Shows or here for
FIFe show dates/venues etc.