Go to some Arab shows and watch. Walk through the barns and get a good look at how the horses are groomed. If you are going to jump into this you need to be informed and aware of the rules. I haven't shown in Arabian shows for years and would need to re-educate myself as things change.
Go plant your buns in a chair on the rail and get your eyeballs on the real deal.
Have fun...and it will be a lot more fun if your prepared!