Sorry for being overwhelming. Read this post step by step and have a glance at the links.
When I search for this stepper motor, I find that it is 5V to 12V 
It is a stepper motor, that means that current is more important than voltage.
Do you know what a stepper motor is ?
It is not possible to connect it to 5V or 12V and make it turn.
It is a uni-polar stepper motor with magnets inside. Stepper motor - Wikipedia
This shows that it makes small steps : Stepping motor running without driver circuit - YouTube
You can buy a normal DC motor and control it with a mosfet.
Or you can continue with the stepper motor, and you need a ULN2003, or a module with the ULN2003. In the examples I see they all use the same module. It costs a dollar : uln2003 (board,module,arduino) for sale | eBay