The place to start when you are designing your dream kitchen is with a dimensional diagram of your kitchen space. On a large piece of graph paper, draw the outline of the kitchen space, including any doors or windows that you will have work around while you design your kitchen. Accurately mark where your plumbing and electrical supplies are located. You can move plumbing and electrical supply points, but this involves more time and money, and it is always easier to accommodate existing service supplies into your design, if practical.
Moreover, a team of professional kitchen designers can perform an ocular inspection of your home and evaluate the space that your kitchen will take and how you can maximize its functionality. This is crucial so that the designers can plan the aesthetics and the logistics of your kitchen according to your needs.