For new exhibitors there is usually a class you can enter. But in the baby puppy class the judges should be very very helpful to you.
Get the judging schedule (usually available one week or so after the close of show entries). And then see what ring and what time your class is being shown. Go to the website of your show superintendent - for example one such website is
www.infodogs.com
Generally speaking - you must first get your armband, usually found with either the show secretary (and their table or booth will be marked as such). You will receive a conformation email of your entry, print it out and bring it with you on your first show day.
Find out where the grooming area is; arrive early so that you are not rushed at all. At least 90 minutes before your class is scheduled to be judged.
Now many exhibitors have what is called a ringside grooming table. A small collapsible table that you can carry with your dog to the ringside, and do the very final grooming touch ups. It is also advisable to have a crate for your dog. This you can use within the grooming area, should you need to go to the washroom, or sort something out.
For showtime, and at least 15 minutes in advance of what time the judging schedule tells you, go to your ringside with your dog and your armband and your final grooming brush/comb etc. Set up your ringside table, watch the ring and the judging of the breed that is going on before your breed.
The ring steward controls the entry of the participants. You will be known by your armband number. The ring steward will call Yorkshire Terrier Puppy Class under 6mths old. Gather your dog and come to the entrance to the ring.
The steward will direct you when to enter the ring. Go to your right as you enter the ring. The steward might tell you to stack your dog ..over there and if so do so. If he tells you nothing go to your right, kneel or stand or what ever position you use for stacking your dog, and stack him.
Then you wait until the judge comes up to you and gives you instructions. Usually the process is the judge will ask you to go around with your dog and then the down n back, also you will be asked to put your dog up on the examination table for his exam. The table exam is often done after the go around, but not always.
My best advice is to really listen well to the judge, and relax and try to have fun in the ring.
Once the judge finishes with your dog, you wait on the sideline, while he examines other dogs, then as the total class usually you go around the ring again. The judge will place the dogs 1st 2nd 3 third etc. Wait for your ribbon, then exit the ring.
Sorry it is so long, but I do hope you have taken some show handling classes.