Q: apple script to change startup disk and NVIDIA-driver activation

I have 2 SSDs via PCI-Card in my Mac Pro (SSD1 - Yosemite 10.10.5 / SSD2 - Mavericks 10.9.5).

I need a script to to set the startup disk to the other SSD, activate/deactivate the NVIDIA-driver (sudo nvram boot-args="nv_disable=1" / sudo nvram boot-args="nvda_drv=1")

and reboot the Computer. Maybe someone can help me with this?