PolInSAR using BIOMASS data in PolSARpro

I have been working with BIOMASS data in PolSARpro for PolInSAR work. I have been able to extract the full-resolution .bin files for each polarization from the measurement of the BIOMASS product. Now how to proceed from here? Are there any tutorials or documents specific to BIOMASS data processing available? Also the coregistration step should be done in SNAP first or in PolSARpro? What is the correct order of operation here?