Read all of:
The devices section of: https://www.thethingsnetwork.org/docs/devices/
The gateways section of: https://www.thethingsnetwork.org/docs/gateways/
The network section of: https://www.thethingsnetwork.org/docs/network/
The applications and API sections of: https://www.thethingsnetwork.org/docs/applications/
Convert your Feather to being LoRaWAN:
with some cross-referencing to:
(use as appropriate for your board)
Find out where your nearest gateways are:
https://www.thethingsnetwork.org/ - map half way down the home page
https://ttnmapper.org - this will show you coverage for active gateways that have been mapped
You can ask questions at any point, but don’t try to read too much in to too much detail, just let it ride, some pieces will fall in to place as you read more & do more.
In an ideal world you have access to a gateways logs for any debugging, but the Feather M0 is a first class citizen in the Arduino LoRaWAN node world. Best current library for it is:
Do NOT under any circumstances make your first test anything other than the ABP example. Many people try to build their v42 secret design before they have even wobbled once down the road on their new reverse steering unicycle. Don’t be that person.