You should look for the debian packaging doc for python, other that can be useful is the stdeb tool, a Python to Debian source package conversion utility.
For running it as a daemon you need to create a init.d script (you can see how to here, and here a more complete example), you can add the init.d script in the package and then call "update-rc.d myscript defaults" from the postinst script of the python.deb and call "update-rc.d -f myscript remove" from the prerm script.