I don't know about a tutorial, but I do know where to edit them. Take a look at data\text\export_advice.txt for the text part and data\export_descr_sounds_advice.txt for the sounds. Also note that the files there are packed, that's why you can't find them. You can, however create new ones and use them without packing (just modify the location and it's gonna work).

CocaCola97