Not sure what you mean by not being available on retail, as you can currently rearrange your character list on both the live version of WoW and in WoW Classic (this being one of those anachronistic minor things they decided to leave in for 1.13 even though it definitely wasn't there in vanilla).
i am in a quite similar situation with Ulthar. I am, aswell, looking for a chill pvp oriented guild for some bgs and arena games.
My pve exp is up to ICC in multiple wotlk servers but due to irl schedule i cant be in a raiding roster regurarly, thus leaning to the pvp aspect of the game nowdays. Weekends are chill though and probably the time i can enjoy the game for long.
Eng is my second language but feeling pretty confident comm in it.
Currently started as human lock that could turn to DK but still thinking about it. I am only 18 lvl so if theres a promising guild in horde side i dont mind starting over.
My only requirement is to hang out and play the game with few adults (even memelords) and not a bunch of rage tilting kids. I know, maybe asking too much here but u never know. I will be following that thread for any info.
Have a good one