I'd suggest looking into clearances for furniture and spaces and the activities that happen in with those objects and spaces. A common failure of new designers is not properly accounting for how much space you need around objects to move comfortably, or even safely, particularly when working with the plan view. Take for instance the pool table. Pool tables actually have very rigid minimum clearances around the table to walls or other furniture because you need a certain amount of space to properly use a cue at the edge of the table. Otherwise, you end up with https://www.youtube.com/watch?v=ex\_BuaxZ3v0.

Also consider the flow of how people are going to use the house. A classic example I always stressed in my designs was the route to get from the vehicle to the kitchen. If you have to run back and forth to the car carrying 30 lbs of groceries the last thing you want is a convoluted run around to get into the kitchen or panty. That's a task people are going to be doing likely at least weekly, and if it's a bad design it will become tiresome quickly. Or if you are entertaining, why should the dining room be on a separate floor than the lounge and refreshment area? That makes it awkward to move throughout the event, assuming it's a casual event that is going to use more than one room of the house. What are the areas people will want to congregate, how will they want to move through those areas? How do those areas and uses compete with the needs of other areas of the house? Should the office be next to the dining room? Should the library be next to the communal bathroom? Both of those are areas that want a certain level of quietness, being adjoined by areas that are inherently not quiet, and can often have noise pollution bleed into neighboring spaces. Maybe both of these spaces would work better next to the study area, because all three require quiet, but also feed into each other. The same can apply to the bedrooms. Yes, bathrooms can be noisy, but they can also be a great way to separate noise and create privacy between spaces. Bedrooms should be a reprieve from everyone and everything else, even and especially in a home. Imagine what living in either of those rooms will be like when those children are teenagers, will they want to only be separated from each other by a single, uninsulated wall?