welcome to 8WR, young warrior!
It depends on what you're looking to play, most people either play SC2 via Dolphin Emulator and SCV, now there is a discord group in which you find opponents for SC2 and there's a Facebook group if you're looking to throw down in SCV
https://discord.gg/6rUxVcj (discord group is mainly used for SC2)
https://www.facebook.com/groups/1495615137403071/?ref=bookmarks (this here is Party Wolfs FB group where you can ask for games and request assistance in MU's in a controlled environment)
https://www.facebook.com/groups/284631121586118/?ref=bookmarks (this group is the main hub for SCV, pretty much everyone is in this group but warning...drama does occur, however do not be deterred by such trivial things, as long as you show the willingness to play and improve, people will help you)
good luck and stead fast, brave one! your journey starts now!