When you are designing a new kitchen it is important that you consider the ways you tend to use your kitchen. Are you the sort of person who loves to cook? In which case, you will want to have plenty of space for preparing and cooking food, possibly with more than one cooking area. If you normally use the kitchen as a social area, making sure that there is enough room for a table and chairs will be a priority.
Whatever way you use your kitchen, it is a good idea to plan out your space first using paper and pens. This way, you can try out different layouts easily and you can quickly make changes to your style.
Once you have a plan in place, it is up to you whether you choose to do the whole installation yourself (a real DIY job project!) or you get a professional kitchen fitting company to do the hard work for you. Obviously, the more help you get, the more expensive your kitchen will be.