Here are some resources regarding ARRL Radiograms, Traffic Nets, and passing formal message traffic through the National Traffic System (NTS).

ARRL Radiogram Explained

ARRL Radiogram – PDF (Fillable)

ARRL Radiogram – MS Excel

NTS-MPG – “The Great Big Book of Everything” National Traffic System
This document, NTS Methods and Practices Guidelines (NTS MPG), is attached to the ARRL Public Service Communications Manual (PSCM) as Appendix B, and is the working reference manual on Message Formatting, Message Handling, and Traffic Net Procedures in the NTS and NTSD. It shall be the uniform reference guideline document for STMs, Section/Local NMs, and Area Staff members.