Hi there! I’m part of a guild called The Noble Few on Stormrage that might be what you’re looking for 
We’re a mix of newer and experienced players who are looking to create a chill, friendly, and learning-focused environment. While our main raid team is currently pushing towards AOTC, we also run fresh heroic runs on Saturdays that are focused on getting newer people up to speed and learning the mechanics. We’re a small but kind group and we’d love to have you!
More info here, please reach out if interested!
https://us.forums.blizzard.com/en/wow/t/usastormrage-the-noble-few-new-player-friendly-guild-pushing-for-aotc-78h/1545833