[Hugh R]

You need to get the water out that is behind the wall now. Get a rotohammer and drill a hole in the back wall from in the garage at the lowest point, jam a pvc pipe in the hole and attach a garden hose connection, and put a garden hose on it and direct it to the front of your garage. This will drain the water that is behind the wall now. You can deal with the french drain later, and you can plug the hole if you want to later.