WAV files have very limited support for metadata (tags). If MC can't read the tags, then it can't automatically identify the artist, album, song name, etc for each file.
It sounds like you have album, artist, and song name encoded into the file and/or directory names though. If that's true, you can probably get them identified pretty easily. There is a tool:
Library Tools > Fill Properties from filename
Highlight some files and then use that tool to extract the info you want from the file and/or directory names. It has an automatic mode which might work. It also has a template mode which lets you specify how MC should read the information from the filenames.
If you post some examples of how your tracks are laid out (file and directory names) we should be able to help you get a template going that will allow you to do most, or all of your tracks at once.
Good luck.
Brian.