Start by considering your needs in the kitchen. How do you use the kitchen today, and would you like to be able to use it differently in the future? This applies to not only cooking and storage but also to togetherness in the kitchen.
Should the kitchen primarily be for cooking? Should it be integrated with the dining room or living room? Is the kitchen a place where you gather for work, homework, play or a glass of wine after a long day at work? Your needs, desires - and dreams - determine what type of kitchen you should consider and how your kitchen should be designed so that it matches your life as much as possible.