My first recommendation would be to get a free home design CAD program like SweetHome 3D and play with layouts etc yourself, don't worry about the colours and feel / fit / finish just fundamentally work out what you want where.
Also think about how you and your other co-habitants use a kitchen, my wife and I often are in there together doing prep / cook etc alongside each other. So weirdly for us when we had a "long thin kitchen" it actually worked better for us to have it all in a line on one wall rather than do it as the "golden triangle" of sink, fridge and hobs/oven.
I have always fitted my own kitchens as I am very particular / fussy / OCD about it all and don't trust most company fitters not to just bodge the job then hide it

and for what fitters charge these days, it is generally cheaper to take a few days off work and do it myself.
Don't worry about future proofing your colour scheme too much, most DIY places sell "One Coat cupboard paint" these days, so you can refresh your kitchen in an afternoon a few years down the line. It is more important to have decent solid carcasses - as worst case doors can always be replaced in future.
I'll try and dig out the pictures of the last kitchen I did, where I basically followed the above process then went to
https://www.diy-kitchens.com/ and ordered to my design, ended up with the whole lot including my wife's "dream" range cooker done and dusted for £6k
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