Showmanship and Halter are two different classes. Which will you be doing?
I've read this blog before on Showmanship, and I found it very helpful. Success In The Show Pen: Training the Showmanship Horse (Updated)
Showmanship you will lead your horse through a set pattern. The pattern will be at least posted that morning. If it's just local level stuff, it would probably be something simple such as walk from cone A to cone B, trot from cone B to cone C. Stop at cone C. Back up 3 feet. Set for the judge. Pivot 360. Line up. (The pattern you see her do on that blog video is for higher level competition. You won't do anything that complicated at a local level.)
They will have some sort of drawing or picture to go with the instructions.
In showmanship, NEVER touch your horse with your hands.
Take the time every single day to train your horse to "set up" for the judge. Don't spend a ton of time in the show ring trying to get it perfect. My personal rule is to keep it well under 10 seconds. Set the back feet first, and then the front.
Keep the 4 quadrant rule. So if the judge is in a front quarter of your horse (let's say front right shoulder) then you should also be in front on the opposite side (let's say left front). If the judge is in the back quarter of your horse, then you need to be on the SAME side in the front. Keep your movements brisk and sharp in 1 or 2 steps.
Always smile at the judge.
Pivoting is the hardest and takes lots of practice, but you will always pivot your horse clockwise, with you on your horses left side.
When stopping at cones, always stop so that the cone is in the center of your horse's body. Make sure you stay far enough away from the cones so that if you do a pivot, you won't walk on top of it when you come around.
So you'll want to teach Sunny to stand calmly when you ask, trot easily in hand, and stop easily. You'll also want to teach her to pivot around her inside hind foot.
Showmanship, you are judged on how "invisible" your cues to the horse are, and how you can handle/control your horse on the ground.
Halter classes are a little different. The handler is not judged, but the horse is. But of course, you don't want your horse prancing around like an idiot, because the judge won't get a good look at the horse. So you'll still want to teach your horse the same fundamentals for good handling, so you can show off the horse's conformation the best.
Technically, you CAN touch your horse in halter classes. But it's not as professional-looking so I wouldn't recommend it.
Same 4-quadrant rule still applies in halter. Setting up your horse still applies because you want your horse to look their best.
The "pattern" will often be walking toward the judge, then trotting toward. Set up and be inspected. And then trot away from the judge to line up. Or something to that effect. They should post that for you the day of the show.