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.
There are online kitchen design services that enable you to design your kitchen online. Such services enable you to select various components of your kitchen to fit the space you have available, and then have it made up and delivered to you ready for installation. Some firms will also carry out the installation