Hi angel0, welcome to Thunkable! 
Be sure to check out our posts about How to ask Great Questions v2.0, our Community Guidelines, and our Docs as you get started.
With our basic maps integration and the basic Google Maps API, I am not sure you can add directions as you are describing. This may be best done with one of Google’s directions APIs (API Picker | Google Maps Platform | Google for Developers) and displaying the map in a web viewer? It will take some experimentation.