I am also new to this but I have been an EFTPS user for years.  I chose Login.gov to authenticate and all I had to do was provide a method of authentication.  I chose a text to my cell phone and a call to my land line as a a backup.  No photos, etc were required.

I also found a software to download from the EFTPS site - Go to Help & Information at the top of the page and look at Downloads.  Look at Documents for Batch Provider Software User Manual.  Go to Software to actually download the program.  I have not done this yet as the only client I did payroll for I recently fired for not getting me information in a timely manner.

Hope this helps!