I've never played any ttrpg online before and I'm wondering how to set it up. It's not the tech I dont get, it's the people. It seems the scene for online OSR play is pretty dead.
There are lots of discord servers with people running and playing games. Check to see if a game you like has a discord server and look for a way to run or get a seat at a game.
Also, depending on what you are into I can invite you to my friend’s server where we run a bunch of OSR games. I believe a Mausritter game is starting up soon and we have different games running almost every day of the week.