Think about what you want to use each room for as many will have more than one function. I am a big advocate for multi-functional furniture pieces, for example, the radiator in the hallway doubles as a console unit and has glove warming drawers within, where as the unit encasing my bookcase has two hidden side panels with internal shelving which doubles up as a home bar.
Finding your own personal style takes time but once you find it, try to create a sense of flow and cohesion through the whole home. For example, I’ve used the same bespoke oak floor throughout the downstairs, which draws the eye through to the garden. You can still section off different zones using rugs. I used four different paints for the downstairs as the natural light is different in each room but I ensured they all blend into one another so there is only a subtle change as you move from room to room.