Many thanks for your question.
Firstly, in the Community Toolbox website, you may have several suggestions for building a Coalition. If you see: LEARN A SKILL, Table of contents (at https://ctb.ku.edu/en/table-of-contents) you may find, in Chapter 5. Choosing Strategies to Promote Community Health and Development (https://ctb.ku.edu/en/table-of-contents/assessment/promotion-strategies/maintain-a-coalition/main), Section 6. Coalition Building II: Maintaining a Coalition, paragraph “CARRY OUT YOUR MAINTENANCE PLAN”, the description of the role of External Reviews, which may be similar to a lawyer consultant. In the same website, you will find Chapter 42. Getting Grants and Financial Resources (https://ctb.ku.edu/en/table-of-contents/finances/grants-and-financial-resources/financial-sustainability/main), and its Section 3 with a description of “Developing a Committee to Help with Financial Sustainability”.
Moreover, if you “BROWSE PAST QUESTIONS AND ANSWERS”, looking for “Creating and Maintaining Coalitions and Partnerships” (as Core competence) (https://ctb.ku.edu/en/ask-an-advisor/questions?data_2=16&data_3), there is an answer (posted on Fri, 08/11/2017) that probably will be interesting for you.
Nevertheless, the legal rules for managing the financial aspects of a coalition may be different in different local area and local Institutions. Perhaps you can ask a consultant with expertise in non-profit organizations before to proceed in donations or fund-raising.
Many wishes for your projects!
