If this is the first year in the ground you really should not do anything with the exception of the most vigorous limbs. Your going to want to reduce that so it doesnt over take the tree.
To keep the tree small you best look at @Richard posts for visuals.
Flavor Grenade Pluot - Pictures! - Growing Fruit
Mid Pride Peach - Pictures! - Growing Fruit
Eva’s Pride Peach - Pictures! - Growing Fruit