I don’t have a tutorial, but once you do have a Linux install, for standalone games I can recommend checking out Lutris. It has many user-provided install scripts that can set up games automatically, seems to include Guild Wars 2: https://lutris.net/games/guild-wars-2/

Interestingly, Guild Wars 2 is apparently also on steam - for steam games I recommend looking them up on protondb, in many cases windows-only games work out of the box, but if you’re not afraid to do a bit of tweaking, you can often find fixes there: https://www.protondb.com/app/1284210