Currently the GooglePAD plugin doesn’t expose everything you need to setup fast-follow and on-demand packages in blueprint. You need to work with several C++ classes to mount, set mount point, connect asset registries and .bin files etc.
If you’re decently confident you can do that, parts of the process is pretty well described in a PDF document I created for my soon to be released product over at [Plugin] Android Asset Delivery (Easy Google PAD).
The document can be found by scrolling down on that forum post!
I hope it helps you get past some of the hurdles with setting up GooglePAD for your project!