ECMWF data in wrf

[saurabhsingh123op]

I have earlier used FNL, CFSR, Reanalysis-2 data set as input in WRF. However, I am finding it difficult to download ECMWF data as there are so many variables. Can anyone with experience in ECMWF let me know from where to download ECMWF data for WRF?

I need ERA-Interim Project to input into WRF. I have the link (https://rda.ucar.edu/datasets/ds627.0/) , I just don't know which variables to download and how to input in WRF.