The first thing you are going to want to focus on is bedrooms. How many bedrooms are you going to need for you and your family, are you going to need additional rooms for visiting guests? Where do you want the bedrooms in relation to the living areas?
You may want your bedrooms away from the living spaces, especially if you have younger children so that you don't disturb them when you have visitors in the evenings, enabling the children to get their sleep and enable you to relax and enjoy your time with family and friends. You can check out custom home build services at https://truaxdesigncentre.com/entertainment-centres/.
Take a careful look at the bathrooms you are going to need. If the design is a double storey, then you will want at least a cloakroom downstairs for visitors and maybe an en-suite off the main bedroom. In addition to this, do you want all rooms to be en-suite so when your children are older they have their own space or do you want a single family bathroom that they can share with ease.
Always focus on storage. Every home needs ample storage, so when it comes to your unique designs ensure you provide enough cupboards in each room, from the kitchen to the bedrooms and bathrooms.