“A place for everything, everything in its place” keeps things organized. Walk through your home and find a place and system for everything. Make sure it is manageable for everyone in the home.
You may find it worthwhile to develop the systems as a team. You’ll get more buy-in from all. And you never know what kind of great ideas you’ll get from your family.
And then communicate it to all. It is important that everyone knows the ‘where and how’ of the systems.
Be accepting and forgiving as everyone learns the new systems.
Lastly, review the systems periodically to see that they really make sense for the way your family lives. Adjust accordingly.