Start here
Take a breath. This is more doable than it looks.
You do not need to do everything today. Work through these four layers in order, and stop whenever you have done enough for one evening. Each one makes the next easier.
Whenever you can, talk with your child about what you are setting up and why, and agree the rules together. Settings help, but open conversation and clear boundaries are what last.
In this order
NetworkFilters set at your broadband provider, router or mobile network cover every device that connects, including the ones you forget about.DeviceThe controls built into iPhone, Android, Windows, Mac, YouTube and games consoles. These follow the device wherever it goes.AppsThe settings inside the apps and games your child actually uses: who can message them, what they can see, and how long they can play.ConversationSettings only go so far. Open conversation, and clear boundaries and rules you agree together with your children, matter most: family agreements, screen time, and what to do when something goes wrong.
Start with the network layer: one change at your broadband provider covers every device on your wifi.