To install elementary tweaks follow the following
sudo apt-get install software-properties-common
sudo add-apt-repository ppa:philip.scott/elementary-tweaks && sudo apt-get update
sudo apt-get install elementary-tweaks
Tweaks will be installed into the system setting folder
In relation to the minimize/maximize it is the double arrow icon on the right top.
What I think you want is for the window to minimize all the way to the the dock not just resize to a smaller window. For that you do have to either right click or click on the apps icon in the dock.