Go to Google Maps. Then enter your address in the search engine. A map of where you live should pop up.
Zoom and pan the map to get to the area you want to cover in your map. Hit print, and then cancel the print. A larger version of the map will be on the screen. Click Print Screen on your keyboard.
Open Photoshop or some other graphics editor. It's best to use one like Photoshop that can handle layers. Create a new document. Photoshop will automatically make this new document the same size as your Print Screen capture. Paste the contents of the clipboard into the document. Use the selection and crop tools to remove everything in the image you don't want in the map.
Create a new layer above this one. Now use the Brush tool to paint in the streets, the house, trees, and so on, using the layer underneath as a template. Change the colors to suit what you are painting. Try to stress things that children might notice, like putting an image of a dog where there is a large dog is in a neighbor's yard, or the corner stop sign where they get picked up by the school bus.
Delete the original map layer, save your work, and print your new, simpler version of the map.