Funds are a subdivision of assets.
Each fund falls into one of seven categories, ranging from "For General Operations" to "Existing Property/Furniture/Fixtures". There is a combo box on the fund record form to allow you to set the type fund each record represents. Thus you would probably have a fund (each) for your land, for your buildings on that land, and the furniture and fixtures within the buildings.
You would also have a fund record for the moneys collected and spent for General Operations, and for any other special use, such as a Building Fund, a Flower Fund, a Memorial Fund, etc.
Each Fund is housed in an Asset Account; a combo box listing all your defined assets is included on the form for Fund Accounts. You must say which asset houses each fund.
There is also a text box in which you must enter the Original Opening Balance of the fund. "Original" means at the time of start-up of CB/DB, because thereafter, the balance in each fund will be calculated from this opening balance, plus any deposits into the fund, less any expenditures from the fund.
Money (or equity value) is added to a fund by the use of Income Accounts linked to the fund. When you receive donations, the (usually) money is assigned to an income account such as "Pledged Support" or "Plate Offerings".
Money is deducted from funds via payments charged to Expense Accounts linked to the fund. When you write a check you use an expense account such as "Clergy Salary", "Utilities: Telephone", etc., which are linked to a fund such as "General Operations Fund".
The Fund Record form has buttons which will allow you to browse the Income and Expense records that are part of the fund.