Since you are just starting to edit the map, can I ask you whether you have seen the WAZE GPS Channel on YouTube ?
Waze GPS Channel
There is a Waze Map Editor Guide, which has six parts. I recommend you watch those, and also go through the Map Editing Wiki. These resources will give you a good idea of how to correctly update maps and give the user the best possible directions to reach a destination.
Waze Map Editing Wiki
Please come back to us after you have understood these resources. Feel free to ask us any doubts or questions if you have any.