I am new to the game as well, but my recommendation would be to check here http://guides.gamepressure.com/divinityiiegodraconis/guide.asp?ID=8163

before mindreading randomly, the guide seems to indicate which quests are prompted by mind reading and I beleive the list is complete, I just know that mindreading can be amusing but expensive at the same time due to the experience penalty, especially if its unneccessary