In a nutshell, this is what every conservative — including you, dear reader — needs to do ASAP:

1. Contact your county Republican Party Committee, find out when and where it or your local district Party Committee meets (terminology varies from state to state), and attend the meeting.
2. Introduce yourself. Be friendly, polite, and low key. The current officers may be wary of outsiders. Ask if a vacant precinct committeeman position exists for your precinct and volunteer to be appointed to fill it. If no vacancy currently exists (extremely unlikely), volunteer to be a “helper” for the existing precinct committeemen.
3. Ask for a copy of the precinct committeeman handbook of your state party committee and study it and learn how to run for precinct committeeman in the next election for these positions.

There’s more here: https://theprecinctproject.wordpress.com/