setting up a ppa

setting up a ppa

I've written a program that I want to share with others via a ppa. How do
I set up a ppa? Yes there is the documentation but I don't know what the
system does when I say "sudo apt-get install 'prog-name'" from that ppa.
How does the OS know where to copy it?
Do I have to write code or do anything else, that the program has its icon
(to start the program) in the dash?
My program ist that easy, its only a zip folder with:
the main.py file
subfolders that contain settings and icons
From my point of view, the system would(should?) only download it to
somewhere and create a executable link to the main.py-file.