Depending on how you want to record (either on a laptop with a DAW, or on a Micro SD card), there are a few basic steps to getting set up correctly. Here's a video of James from Pirate explaining the steps to getting set up using the RODECASTER PRO.
If you're using Garageband, here's a step by step tutorial to setting up multichannel recording: Garageband Multichannel Set Up Tutorial