near perfect confo, registered, great pedigree, and proven. your mare needs to have these as well. please breed responsibly. there are many unwanted horses and ones that can barely walk due to back yard breeding. this fuels slaughter. please dont contribute to suffering of all the unwanted horses
What are her faults? What needs to be done to improve them? That is one of the first things that I would go through to pick a stallion. You also need to access the stallions faults and ensure that your mare has those as her strengths. For example, my mare has a lower set neck than I prefer so that would be one characteristic that must be excellent.