Thank you for all of your help and information!
So the attached layout on a breadboard is how it should be wired up to match the schematic, correct?
I have an IRF510 N-channel MOSFET, which sounds like it would be a better option for higher power needs. Can I switch out the TIP120 for the IRF510, keeping same layout and same resistor? As I understand it, the TIP's Base, Collector, and Emiter are the MOSFET's Gate, Drain, & Source, respectively.
Thank you, again!