Guys or stakes should be removed as soon as the tree appears to be established, usually within one year. You should remove broken branches. Thinning or cutting back generally is not recommended. Consult your nursery worker or arborist before severely pruning so that you do not damage the shape of the tree. You do not need to apply a wound dressing to pruner cuts.
Most paints damage the growing surface.
Tree wound dressings do not prevent decay or disease and are for aesthetic purposes only.