Hello, and Welcome to Linux Mint! There sounds like there's a specific problem with lich king on linux, maybe someone on the wow linux forums has a solution. Seeing as you have a series of steps to bypass the issue though, the automation is actually quite easy, you need to create a shell script. To do this, you create a new (text) file called wow.sh in your home folder and make this the first line:
Then you put the commands you normally type into the terminal into this file, one per line. Once finished run this command:
You can then launch it using alt+f2 and type wow.sh, you could even create a menu item for it if you prefer.