Help with calibration, DEM coregistration and ellipsoid correction - CosmoSkyMed

Hello!
I have 8 Cosmo-SkyMed HIMAGE (HH) (CSKS1_SCS_B_HI_01_HH.h5) and I have to do a pre-processing (I have to do an elaboration with PIV, particle image velocimetry) that consist in 1) calibration, dem assisted coregistration with Xcorr and ellipsoid correction, but I have never used SNAP before. I starded the calibration process in Radar → Radiometric → Calibration and I select “intensity” as source bands and also “create gamma0 virtual band”. Did I do it right?
Thank you!