You need to open Safari, and go to Google Maps. (maps.google.com) It should open the Mobile version ( not the classic version that you see on your laptop) .
You also need to make sure that location services is enabled for Google - when you go to maps you'll probably get a pop-up asking if it's OK for Google to use your Location. Say yes.
Then in the top menu, tap on the the icon that looks like a square with an arrow popping out of it. This opens a box in which you should be able to choose, Add to Home screen.
It should place an icon on your home screen for Google maps.
Hope that helps?
Andona