Percherons can be big girls. Thorobreds can be sharp, fast and sensitive. Seems to me you have an ideal hunter. First thing to learn is that heavy horses may not be agile and fast but they are strong. In time she'll show you what she can do and more importantly what she likes to do. Keep her sweet, treat her firmly but kindly.
In the meantime, whilst she is young get in all the basic schooling. Lots of work on the ground. Lots of basic schooling in the arena. Once she gets to be fully grown, if she has not learned good manners as a youngster then she could be quite a handful although Percherons are known to be a kindly breed.
It is all up to you - you have a broad canvas on which to paint a picture.
English or Western or SPanish or Aussie or ??? - it doesn't matter. Just make sure that when you ask her to do something, she willingly does it.
Have fun together.