The first thing to do is to decide exactly what it is about your present kitchen that you really like, and what about it you do not like. Then make a list of questions such as the following: Do you have enough counter space? How about storage capacity? Is your food preparation area large enough? Is everything you need convenient, or do you have to keep going back and forth across the kitchen to complete each task? Lighting needs? Flooring? Countertop choices such as Granite, Quartz, Corian or Laminate?
If more counter space is needed, where can you fit it in? If more storage space is required, can you add another pantry, or perhaps expand or deepen the one you already have? If you find yourself traveling too far to accomplish tasks in the kitchen, can you add an island in the center to make things more handy? If you have more than enough pots and pans, can you hang some of them on the wall?
Other considerations include making things more convenient in your kitchen. For instance, can you arrange the microwave to be very close to the food preparation area? This will help you quickly and easily heat and defrost food as you go. Likewise, the dishwasher should logically be close to the cabinet where your glasses are stored. The refrigerator is usually the most used appliance in the room, so why not try to centralize it in your new kitchen design.