I googled and found very different dosages for Echinacea, but it's hard to overdose, they all agree. It says 5 grams daily as preventative, 10-20grams on another site. It is specifically mentioned to not give it all the time, rather for 3 weeks, then a week off.
For licorice I found one teaspoon daily
Marshmallow root 1 tbsp twice daily.