I would never recommend anyone attempting to open a shop without an experienced designer. Before you open but when you have all your legal paperwork such as state license or sales tax papers, contact the state florists or floral association. See if they have any classes, certification courses etc. Check out Teleflora's Education Programs in Oklahoma City, OK (I don't believe you have to be Teleflora to attend). These things may push back your opening date but very worthwhile not only for business practices but for the most important part of any florist / floral shop, that is design, care and handling, and customer perception of your professionalism.