You are likely to need to procure a number of goods and services for your community building. This may range from simply seeking three quotes for a piece of equipment you need to purchase, or for a trades person to carry out a small job, to having to formally tender for maybe a larger construction contract or contract to deliver ongoing services.
This useful guide from Heritage Fund looks at Writing a Brief for the Procurement of Goods or Services.
This template would be suitable if you were looking to appoint a consultant to carry out a piece of work.
Facilities Management - Commissioning Consultants template - General.docx