Steps:
- Download rasperian image os: https://www.raspberrypi.org/downloads/raspbian/
- Download Win32DiskImager https://sourceforge.net/projects/win32diskimager/ or Etcher https://www.balena.io/etcher/
- Write image to SDHC with one tool from Step. 2
- Put ssh file in SDHC.
- Put SD card to raspberry pi and connect pi to your modem.
- Check address port alocated from your modem by accessing 192.168.0.1 or 192.168.1.1
- Connect with putty.exe https://www.putty.org/ by ssh to pi with user: pi and password: raspberry