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I've got the same and I do the following:
To show a list of apps that can be moved to the SD card go to settings > apps and swipe right to show apps on SD card. Annoyingly you then have to go into each app in the list and select move to SD card.
Also annoyingly you have to repeat this when an app updates.
Also go into settings > storage regularly to move data to SD card, clear cache and clear miscellaneous items to free up space.
Quite happy with Moto G 3rd gen 8GB .. just need to know an effective way of using the external SD card storage more than local storage.