Temperature Sensing Machine and Sprayer

I am creating a automatic spraying robot that senses temperature and activates a sprayer and a motor to move the device forward and back.

Thermistor would be linked to an arduino. At certain temperature the arduino would send a signal to the 12V motor to turn on. This motor powers wheels that let the robot move forward and back. The arduino would also send a message to an automatic sprayer to spray.

Any advice on how I can wire this? Power it? Program it?

A link to an motion sensing automatic sprayer prayer (inspired me to create this robot) https://lifehacker.com/this-auto-trigger-spray-bottle-pranks-friends-keeps-ca-1555621712

Tell us what you have done so far.