Returning Player from years back. Bronzebeard

The last time I had played was during mists of pandaria I believe, but i started when the game first came out. Anyways I have had an itch to play warcraft again. A lot seems to have changed and added. Looking to see if anybody, or guild, is looking to help catch me up on what is going on. Looking for a place even online that can explain everything easily to catch back up.