There are a number of good references now to help you with setting up custom bindings. It’s worth learning how to do this because you get a huge amount of flexibility with setting up your controllers exactly the way you want. Of course for controllers that don’t have default profiles already set up in the sim you don’t exactly have a choice 
- MSFS Controls Guide 1: https://flightsimulator.zendesk.com/hc/en-us/articles/360016018600-Peripheral-Control-Settings-Overview-and-FAQ
- MSFS Controls Guide 2: [HOW TO] Use the Interface to Configure Your Controllers
- Sim UK How to Setup ALMOST ANY Controller in Microsoft Flight Simulator 2020 - MSFS Controller Tutorial - YouTube
- Squirrel Tutorial #2 - Peripheral Control Setup - Microsoft Flight Simulator - YouTube
And this one on the Camera system: