Look over several different designs an models before deciding try mixing different styles together to create a one of a kind kitchen an not just an of the shelf model, Pay sum attention to where you want sockets switches an outlets you wont want cables from appliances running along the worktop in plain sight. Do you have enough room in the centre of the kitchen for an island, Some hidden storage space some accessories to make your kitchen be all it can be.
Last but not least make sure you choose the right people to fit the kitchen ask if you can see some of the work they have done or if thy have references you can check, You wouldn’t want to go through all the trouble of designing the perfect kitchen for somebody to fit it badly.