This is a Japanese page that I refer to when routing this game:

http://gesato.com/gb/Dorasure-Gaiden/top.html

Most notable here are the first and third items on the index page (攻略 and 各種データ; "walkthrough" and "assorted data" respectively). The walkthrough page explains where to go (including optional content for each class), and includes stats and brief strategy notes for each boss. The "assorted data" page contains tables listing each item in the game and its stats and effect. (It does not, unfortunately, list where each item is acquired, which would be really useful.)

Google Translate isn't too terrible on the walkthrough, but, as always, be a little skeptical of anything that it tells you.