many thanks for your interest in Community Tool Box.
Perhaps you don’t find something just specifically devoted to elderly abuse, however, on our website, there are a lot of suggestions for building a strong community committee.
I may suggest you, among our resources, Chapter 5. “Choosing Strategies to Promote Community Health and Development” on the web page https://ctb.ku.edu/en/table-of-contents-community-assessment/choosing-strategies-to-promote-community-health-and-development, and in particular Section 5. “Coalition Building I: Starting a Coalition” https://ctb.ku.edu/en/table-of-contents/assessment/promotion-strategies/start-a-coaltion/main, and then the following Section 6, on Maintaining a Coalition.
I think that you will find useful ideas for your project.