Assuming you would like to use Google Maps without the API, there are a few ways to get started.
The first would be to use the Google Maps website itself. You can create a custom map with specific locations plotted out, and then use the "Get directions" function to generate directions with arrows.
Another option would be to use Google My Maps, which lets you create custom maps with a little more functionality than the standard Google Maps website. With My Maps, you can add different layers to your map, including directions with turn-by-turn arrows.
Finally, you could use a third-party mapping website or app that uses Google Maps data but doesn't require the API. Some examples of these are Map Quest and Waze.