Minimize on click

Minimize on click is not enabled by default and to enable it, you need to use CCSM:

sudo apt-get install compizconfig-settings-manager

And then, open CompizConfig Settings Manager, click the Ubuntu Unity Plugin and on the Launcher tab, you'll find an option called "Minimize Single Window Applications (Unsupported)".

Later on, this feature will most probably be configurable through Unity Tweak Tool and other such applications.