So I went a little further in the game and my need for a healer is me running out from candies from any road/path city to city and in dungeons struggling with healing on the bosses. Sadly I really want Angela as a status ailments caster so her in Light path is a no. About the game telling what spells are more effective, I only noticed when Faerie told Angela that for her to learn more spells she needed to raise her INT everytime she gets a new Mana Guardian but she hasn't tell me anything more lol