Getting licensed information at ARRL.
There are lots of training resources online. I found Ham Test Online to be very useful.
Some APRS references:
All-in-one handheld APRS radios currently in production:
Some APRS capable tracking transmitters that are currently in production:
Do a web search for "aprs tracking transmitter" to find *lots* of build-it-yourself options.Here is a redacted set of the presentation slides in Adobe-Acrobat format.
Link to Will's other NARCON 2020 talk Air Launching NASA's ICON Space Weather Mission.
For further information contact Will Marchant via email by marchant at novaar.org