Step-by-Step Custom Driver Install

I was able to get a custom device driver working for my First Alert Combo Smoke/CO2 Alarm. It was not hard given the instructions you gave me @bobbles. Thanks very much!

I'm still not clear on how to get LifX bulbs to work. I copied the code provided here Lifx Group of Groups Driver (ST port), and it's in my custom devices. I also have a token from LifX. Now here I sit. How do I add the token and the devices?

Also, I'd like to add very simple Nest integration, so that I can change setpoints with modes. This thread seems to indicate it can be done. Nest integration. However, again, I can't discern how to get this off the ground. I see the code, but not how to start the install process.

I may seem totally helpless, but I do have 86 devices on my Hubitat device list. So, I'm not totally helpless....

Thanks for any help!