To let my disconnected kids enter the digital world?

[Wonkyboobs]

I've been low-tech thus far. No tablets, phones, games, screens but we allow limited telly a few times a week. I have worked in safeguarding and know the risks of online kids too well... but I am getting concerned that my children are missing out on social stuff and I know I need to relent at some point and guide them carefully into the world we all live in. I have no idea how to do it or what to get. I was thinking a console but don't know which one. Kids are 7 and 9. Everyone seems to be on Roblox.

Any advice welcome but specifically

-am i making a terrible mistake?

-what console do I look at getting? What is a switch and how does it work?

-what games are important to kids of this age group aside from Roblox. What games are good/educational/active?

-what do limits look like in other homes? I am absolutely not intetested in them setting their own boundaries when it comes to this. I am sure it works for some houses but I know of several where it has been an awful mistake.

-How does built in safety work on consoles? Anxiety relieving stories welcome.

Many thanks everyone!

I would also say no to Roblox. DS played it for one afternoon when he was ten, I think, and realised there was no real way of progressing in the game without spending money and gave up.
He has played Minecraft since about age 8, first on a Switch, then a PS5, first in creative (which is like 3D Lego, really) and then in Survival (where you have to mine and craft the things you need to build, rather than have an endless supply - there are books to tell you how to do it). We all played on creative during lockdown building a world, but now he plays on a realm online with his friends. He is 12.
It’s a mixture of limits and self-regulation here but that has been a process of discussion about what works for him and what does not. He’s not online with anyone he doesn’t know and I can hear his side of the conversation. My limits are more on in-app purchases. I would rather pay upfront for a game with no in-app purchases and be clear that is the spend than there be things in it he wants to buy and then it add up,