Use the search bar in the top left to find an address or place.
Click the blue “+”" button in the top left to search for a layer. Check the boxes of the layers you wish to add to the project.
Click “Draw Boundary” in the top of the screen to start editing. Then right click on a parcel or building to “Set” that as the project boundary.
Click on the draw toolbar at the bottom of the screen, select a type of geometry eg “Residential”, then start clicking on the map to draw a building.
If you feel comfortable drawing, the best way to get started is to start building in the app.