I wouldn't recommend using a whip as a discipline tool, but I've seen them use it to help set the horse(tapping chest) and a cue to trot. I think it's in your left hand with the folded lead.
It makes no difference in draft horse or pony, they are usually shown the same, especially with a haflinger.
The mane roll is done the same as in a draft horse but if you can't do it well (takes a lot of practise) skip it and go for a tangle free mane and tail. If you do mane roll with rosettes and tail should be French braided with a bun and decoration around it.
I find its more excepted for a Haflinger to have a full mane and tail, down, than for other draft breeds, which usually have a pulled mane and docked tail, both braided.