Regarding teaching people with little or no exposure to Dhamma, here is a relevant sutta: http://www.accesstoinsight.org/tipitaka ... .than.html
Then the Blessed One, having encompassed the awareness of the entire assembly with his awareness, asked himself, "Now who here is capable of understanding the Dhamma?" He saw Suppabuddha the leper sitting in the assembly, and on seeing him the thought occurred to him, "This person here is capable of understanding the Dhamma." So, aiming at Suppabuddha the leper, he gave a step-by-step talk, i.e., he proclaimed a talk on generosity, on virtue, on heaven; he declared the drawbacks, degradation, & corruption of sensuality, and the rewards of renunciation. Then when the Blessed One knew that Suppabuddha the leper's mind was ready, malleable, free from hindrances, elevated, & clear, he then gave the Dhamma-talk peculiar to Awakened Ones, i.e., stress, origination, cessation, & path. And just as a clean cloth, free of stains, would properly absorb a dye, in the same way, as Suppabuddha the leper was sitting in that very seat, the dustless, stainless Dhamma eye arose within him, "Whatever is subject to origination is all subject to cessation."
In suttas such as this, the Buddha, did not start beginners with the noble truths. He made sure they were properly prepared first.