from where to search service code and get rate on it?

You can see the link below for the Gst rate and sac code:

GST LIST:

https://www.cbec.gov.in/resources//htdocs-cbec/gst/chapter-wise-rate-wise-gst-schedule-03.06.2017.pdf;jsessionid=1486BB4D6A6B029FA356BB0DE0C75D57

SAC CODE:

https://www.cbec.gov.in/resources//htdocs-cbec/gst/Classification%20Scheme%20for%20Services%20under%20GST.xlsx