Hello there and welcome to MG! It’s certainly a busy server where a lot of roleplay can be found; and while you may discover there is roleplay you don’t care much for, there is so much going on that there’s likely something to be found to everyone’s liking!
Since you are asking for general RP advise, I thought I would link the guide written by one of our realm players. It has a lot of neat information in it both for beginners and for those who may have been playing longer.
https://us.forums.blizzard.com/en/wow/t/warcraft-roleplaying-guidebook-for-beginners/805645
Also, I am more than happy to hang out if you would like to test the RP water with a very newbie-friendly and non-judgmental person. I can usually be found daily on my mage Torvia.
But most of all I wish you lots of fun and once more, welcome to MG!