the note tells you "where" to go to find the coins for citizenship but it doesn't tell you "what" to kill.. this is correct..
usually if nothing specific is mentioned as the target of the quest that means multiple things will do.. When I did citizenship in Quenos I had to go into the down below.. and managed to get the coins from bats, rats, and slimes...
however, one clue.. if you kill something and see a big blue message saying something like "you did not find any quest items" or something like that, that means you're killing something that will drop the quest items you need and just need to find more of those.