Keep all your internal doors and door trims white if your skirtings and walls are white as mentioned.

I would choose a grey sofa, but really any colour would look great, tan leather, white , depends what style you are looking for, could be ultra glamorous or a casual boho luxe , love those colours throughout, could look gorgeous

We have used black carcasses for a black and wood kitchen. Looks great and everything is easy to find. Cost an extra $1000 on the total reno but absolutely worth it imo. The white would look cheaper especially when pulling out the black drawers to see the stark white inside. We also opted for dark drawer runners.

Not what I have done, but a picture from James Hardie site. I like the brick contrast. Adds interest. Cladding is Painted vertical James Hardie stria cladding.