You've heard of the Indivisible Guide. Ezra Levin and his team provide resources to the community with a two-fold plan in mind:
1. Demystify Congressional Advocacy
2. Support local groups putting The Indivisible Guide into action
This guide also contains resources and scripts to help people know what to say when the contact their Members of Congress (MoC). Take a walk through their website. It has some great information.