If they are truly the main part of your mental picture, splurge on blooming size, second year plants and compensate by starting some of the others from seed. Soil preparation is NOT the place to skimp. Be sure to do that right. You have only one chance to prepare your soil and that is the first time around. It is the best investment you can make when it comes to building a garden.
Healthy soil means healthy plants and there is just no substitute.
Fifth, just do it. Even the smallest accomplishment moves you forward toward your goal. Get out there today and mark off the outline of the bed, the edges of the path, the length of the fence. Set a pair of lawn chairs out there too for good measure. Stick in a stake where the hollyhocks will be.