Dont worry, I tried it and it's not well thought out.
After taking an absurd amount of time to set up, it only works with the amazon store or sketchy 3rd party tools to let you side load.
It'd be a lot better if the paired up with Google play store, so purchased apps actually transfer and allowed side loading out of the box.
There are non sketchy front-ends for other app stores, including google play, but yes. You have to do a little workaround in order to side-load apps before it is useful.