Well, as long as you have a browser and/or google play on the phone, you can download apps, games, etc., from there. You can also log in to say google play online (just make an account) and then choose what apps you want and install them to your phone from there.
Now, if you are looking to put them on a SD card then that is a different issue. Only apps that allow for running from a card can be moved. You can also move pictures, videos, files. That would save you a lot of space on the device itself.
However, if you are talking about downloading Apps straight to the card, or moving all apps to the card, that isn't possible on your device. At least not with the OS it came with, which is "Lollipop". Only phones running "Marshmallow" can...