Get Directions Google How Can I Get The Driving Directions Between Two Points In My City With Google Maps API?

How can i get the driving directions between two points in my city with Google Maps API? - get directions google

I have a problem I do not know how to give a distance between two points at random from a map of my city. If you GDirections () to use API for Google Maps that the addresses of some streets and the familiar objects in my city, and not for all the shows: (Can someone help me out please.
Thank you anyway!