Creating a Single Copter Custom Mixer and Airframe

Hi, I’m new to the PX4 firmware and I am trying to implement a single copter system (single motor with four servos to control fins) and I’m having trouble understanding how to create a custom mixer and airframe files to replicate this configuration. I have read the Mixing Guide but I am still unsure of what mixer type I would need to use and how I would configure the servos in the mixer. Any feedback would be greatly appreciated.