LOL. Unless you're homeschooling them in the wilderness this is a pipedream. Your children will literally have no friends and won't be able to do their homework.
I very strongly suggest you consider an alternative, and that is to use the Internet with them.
You are very significantly underestimating peer pressure for them to be relevant to their peers.
Left unchecked? Very serious rebellion will be breeding.
No joke. Went through it. Won't again.
I had many ideas similar to yours before I had children.
Like Mike Tyson said, "Everyone has a plan until they get punched in the mouth." After having childre, you realize how sometimes you have to do things just to survive.
Internet is great for learning anything. But you can also find the absolutely worst brain damaging crap ever on it.
My little brother learned to both speak and write English all by himself. We live in Sweden so it doesn’t come naturally.
He used to watch a lot of educational videos on YouTube about animals, the universe and everything. But sadly, today he chooses to watch more of the 5 second attention span decreasing "entertaining" videos.
You can keep a kid away from exploitative media without cutting off internet access. My daughter (11) has full and unrestricted access to the internet except social media services and streaming video. Problem solved.
Good luck. Even schools are pushing that crap now. They'll need to be online to do homework not later than middle school—and that's the state of things now, may well be worse in a few years.
I don't like the idea of setting time limits—I feel like I spent too much of my childhood waiting for the next opportunity to use a computer. Tools are not inherently good or bad, and my child should have the opportunity to explore them as he or she sees fit. However, I very much want to keep my child away from exploitative media, and I don't know how to control that other than just cutting off the internet.
If they play games, I want them to be games that teach something. Zelda teaches you problem solving skills, and Celeste at least teaches something about humanity. Neither attempts to suck you in for infinite lengths of time.