Newbie here, Building a camera slider with arduino. What else do i Need?

Hello and thanks for looking. I am building a camera slider with the Arduino Uno R3, Arduino Motor Shield Rev3, Adafruit LCD Shield Kit, Nema 17 Stepper Motor and a 12V Power supply. My question is besides power cable and USB cable and enclosure, what else would I need to power up my slider? Also do I stack the controller, motor shield and LCD together, and learn to program via USB to computer. Also with the LCD can you control the slider?

These guys seem to have a lot of the mechanical stuff you would need

You need a stepper controller, that NEMA17 motor needs pulses of current to make it change from step to step, the Arduino will control the controller.

Great thanks for your input, appreciate it.