I am not sure what how you want “Artist (first Character)(Artist)(Album)” exactly to look like, maybe give an example. But I would start with something like this for the first part of “Artist (first Character)(Artist)(Album) - (Year)”:
$firstalphachar(%albumartistsort%) %albumartist% %album%$if(%date%, - $left(%date%,4))
This will give you something like “B The Beatles Help! - 1965” for the folder name.
Then for the second part "DIsc (Number) “This only appears if multiple discs(Track Number0 - (Title)” something like:
$if($gt(%totaldiscs%,1),Disc %discnumber% )$num(%tracknumber%,2) - %title%
For a single disc release this will show e.g. “07 - Ticket to Ride”. If there would be more than one disc it will be e.g. “Disc 2 07 - Ticket to Ride”. The script with both parts together:
$firstalphachar(%albumartistsort%) %albumartist% %album%$if(%date%, - $left(%date%,4))/$if($gt(%totaldiscs%,1),Disc %discnumber% )$num(%tracknumber%,2) - %title%