A few items can be enabled directly as indicated in the image.  For example, you can reposition the Dock to the left of the Desktop by simple selecting "Position on Left".  You have the option to view the "Dock Preferences" which will then show you the following:

 

You will then see the same "Dock Preferences" as indicated in first method.

Method Three" Control-click on the Dock.

1. Place your mouse over the divider in the Dock.
2. Once you see the mouse pointer change to something with a solid line in the middle with an up and down arrow, press the control key on your keyboard
   
3. As you keep the control key pressed click the mouse button to show the following pop-up
   

 

From here you can easily modify an option and/or select Dock Preferences.

 

If you look at the second image above, you can see that within Dock Preferences one can modify parameters to adjust the size of the Dock, enable magnification (a scrolling option), its position on the screen, its minimizing behavior, animation effects, and allow it to automatically hide when it's not in use.