This is the follow-up to Step 1 - Establish an Apple ID for your child, Securing an iPhone/iPad for kids, where we enable an Apple solution called "Screen Time". Screen Time allows for granular control over many of the device features, as well as allowing for in-depth control of certain apps on the device, including iMessage and Safari.
There are many steps ahead, but each one is rather quick, but I will try to provide some details to better understand the feature and what I would recommend. All of these settings are tunable now and in the future, so each one will be at your own discretion how you implement it.
- Navigate to "Screen Time" from the settings screen in the iPhone/iPad