My favorite technique for beginners, and one which I continue to use, is to find a time when I can go into a social situation with the supreme desire to express spiritual truth. Try it, and see what happens. This is a recipe for spontaneity. There is no need to have an intellectual formulation of anything in mind that you have to say. Allow things to develop naturally, and see what happens.
The second easy technique is to go to a public place--repeatedly--and sit. After a while, perhaps a number of weeks, of being in the same place at the same time, you will become a normal part of the scene, and people will come up and initiate conversation with you.