Custom Android for New Device

[Katone Vi]

Hello everyone,

I'm in the middle of experimenting the Android OS; I want to customize it like Amazon did with their FireOS and set it on my own device.

I'm new to this whole thing so every help and advice is appreciated!

While building aosp, I ran into "Propriety Binaries".  I presume I am not allowed to use those for my product?

With that presumption, I tried getting started on building the aosp without the binaries.

I am now running into issues during the "build" step ($ m); it isn't starting.

I am pulling from the "master" branch.

Question 1. Am I allowed or not allowed to use the Propriety Binaries for my product?  I presume not.

Question 2: Do I need the Propriety Binaries in order to build android and run it on an emulator?

Question 3: Is the "master" branch the branch I should pull from if I am seeking to not use the "Propriety Binaries"?

As stated, I want to do what Amazon did with their FireOS.

If this is a bad idea, please tell me why so I can learn;  I'm new to this whole thing  :)

Thanks

Katone