Most fitted kitchen companies offer a free design service, so it might be a good idea, if you have the time, to try out several. Nowadays they do CAD presentations showing perspective views which are easier to visualise as some people struggle with plans.
Be aware that although they are all referred to as designers, they are not all equally skilled in understanding your requirements. Some are fundamentally salespeople whose aim is to sell you a very expensive layout. Beware of "special offers" just about to expire, "extra discount if you sign up today". This is pressure selling. You are not obliged to accept any of their offers.
My priorities would be low maintenance- I think you are absolutely right to avoid fancy cornice or frills which just collect dust -and plenty of storage. White gloss units are easy to clean, but beware of dark coloured gloss which shows every fringerprint.
I prefer to avoid handles on doors and find that large deep drawers are easier to find things in than cupboards. You do not need to buy all the extras like skirting boards, which can just be lengths of plywood. If you paint them to match the floor, it gives the units the appearance of "floating".