I would go rhododendron closest to the house, because they will get biggest are evergreen and bloom beautifully in dense shade.
Then I would alternate Hydrangea And azalea. Azalea have tiny leaves that are kept longer, bloom beautifully around the last week of May through June 15t. hydrangea are ugly in winter- just bare stems, but bush out gorgeousLy early spring and around July 1 they bloom tremendously and look good through frost. Your last front short layer, I'd go packisandra between primrose, ferns and bleeding hearts. Primrose are bright happy tough spring plants about 8-10" that bloom just after tulips, the bleeding hearts max at 24" tall and come up early, with primrose then start to die back as hosta and Fern Hit their stride.
