Building, fitting, and furnishing a new house can be a difficult process.
Assuming you've settled on a design or an existing house, it will still be difficult to decide how you're going to make good use of each room, how you want each room to "feel", and what features, fittings, and furnishings you're going to use to achieve that. For creating the best relaxing environment you can in the space you have to work with, it's worth keeping in mind that first and foremost, we build and buy houses to keep ourselves sheltered and safe, the better to work, recreate, and rest. It follows, then, that the sensible approach to planning the indoor decoration of your new home is to put these considerations first. In order to do that, it isn't necessary to plan for knick-knacks and ornaments in every room.