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?
Thanks
Dan

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.