Welcome, Fenris2K!
Online is where it’s at.
Check out Fantasy Grounds / Roll 20 forums and take a look at Rolemaster Youtube videos of sessions in play to familiarize yourself with the look and feel of the tools used.
Baker_Cam and Wolfshield Games, along with others are out there - even podcasts if you don’t need to see combat maneuvers on a battle map.
I joined online groups by watching, first, and commenting/chatting with the groups, whether live or in the “Looking for Player” forums with the GM running games.
Invariably, room opens up in them with opportunities to join in on the awesome crunchiness that is RM!