What should minis look like to show? Depends on the level of the show, but generally the horse show be clipped ( or have a very smooth and brushed coat if in the fall/winter). The horse show look as clean as they possibly can. If your horse is white or has white spots use bluing shampoo to get it extra white. I use a 10 blade for the body, 30 for the legs, and 30s and 40s for the head. Bridle path should also be clipped--if you horse has a nice long neck you can make it shorter, but if your horse has a thick neck keep it longer. Clip hair around ear, some will go and take out all of ear hair, but our horses are outside 24/7 so they would have been attacked by bugs and miserable. Show sheen is also a must. Brush out the the mane and tail. I like to use Cowboy Magic Detangler and Shine and it works really well.
Hooves: Some people lightly sand them and then polish with a clear or black polish. I always like black, but it can make the horse's let look shorter. A good tip is to use a sharpie to blacken the top where you don't want to get too close to the cornet band with the polish.
How do you train them to stand and park in the show ring? Work on getting your horse to stand still and not move if you move around-- a good "whoa" is important. You can lift their legs to move them or push back on the halter to get them to move back and straighten themselves. Then give a cue word like "Set" and reward. Keep practicing this, it will take time. Then show them a treat to get their attention--could be a peppermint wrapper, scented cloth, click pen....what perks your horse's interest. They should perk their ears, look alert, and stretch forward....just make sure they don't move their legs and move towards you, that's where the whoa comes in.
* I attached a picture from a show that I was at 2 weeks ago. She wasn't freshly clipped, but didn't look like a total fluff ball
If you are showing in Halter, cable/noseband type halters are in-style and shows off the horses face.