Tiva C Series LaunchPad and Breadboard
PX#, PBx, etc are Port X, Pin #. PA1 is Port A Pin 1.

You would need a ground connection (all grounds should be connected together internally, i.e. they are the same), and depending on how you want to connect your leds, either 3.3v or Ground, and the other end into a PX#. (VBUS is the USB 5v, and not all pins on the Tiva are 5v tolerant!)

For the most part, the Tiva is like the ATMega on an Arduino. But the Arduino provides more than just hardware, it also adds a level of software abstraction by hiding certain tasks in libraries, like the digitalwrite function, which enables an output pin to a high or low.

The nice part is, the Arduino Language has a great port to Texas Instruments Launchpads, called Energia. It works with the Tiva Launchpad (Essentially a renamed Stellaris Launchpad) as seen here: Guide to the Stellaris LaunchPad (EK-LM4F120XL) 



A fair deal of beginner and intermediate Arduino projects can move over easily with little rewriting, including your Traffic Light project.