You're right, she is older for a first breeding, and that can make the risk of complications much higher. I think you should call your repro-vet, explain the age of the bitch and that she has not yet been bred, when she is likely to be in heat, and when you should bring her in.
If they were doing an AI, then the actual surgical AI, might be best, as they could check for cysts, and possible issues.
I hope all goes well for you. I am curious why you have waited for her to be 5 years old before breeding. Both Arwen and Jenna were 4 when they had their first litters, and neither had trouble with it, so it may be just fine. I just have heard that it is harder the longer you wait for that first litter. I have even heard that there are some type of drops you can give a bitch to preserve the equipment until after the show-career is over.
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.