I have two videos on how to do this and that:
https://una.io/page/view-post?id=282
https://una.io/page/view-post?id=281
But these technologies are changing all the time, so in a couple of months instructions could become obsolete.

UNA is actually react-native app, so any other app can be run the same way, so you may refer to numerous examples in the Internet.

For a while I've created rebrand.sh script to help with rebranding, just change variables to your own and run it.

Also I've maintaining actual instructions in main README file, which is updated regularly. 

So I think this is all I can offer for now.