I got a Spark 2 implanted but no idea what to do with it… how can I get started or write anything to it? Will the TagWriter NFC app work on it? Do I need to program it from a computer, and if so, what hardware do I need to read and write? Highly appreciate any links to tutorials or references on how to actually use this thing…
That’s… An interesting way of doing things 
You should use the vivokey app to set it up and write to it.