All pins on an MSP430 are accessed through their respective ports, P1, P2, etc. Each port is 8 bits wide, which correspond to P1.0-1.7, etc. You access them by accessing the corresponding register. To read from port 1 you would read P1IN. If you want to read from a specific pin on port 1, you would AND it with the bit you want, eg: P1IN&BIT2. To write to a port you use P1OUT, to change the direction (input to output or vice versa) you use P1DIR, to change the mode you use P1SEL and P1SEL2, and so on.
I don't believe the G2432 has a UART port, so how will you be sending data serially? I2C? SPI? You could bit-bang a UART using some GPIOs if necessary, there are guides online for doing that as well.
You should probably start with some simple LED blinking until you get a hand for the clock management system and GPIO interfacing.