The only difference (in my book) between using QB for a non-profit as opposed to a for-profit is __________________ (fill in blank with blank) You still have income and expenses. You still have (hopefully) a year end positive income over expenses, which in your situation is not taxed. It may or may not have to be distributed (spent to zero) which will depend on your charter and your state law. I cannot imagine a case where a state would say to a fire company "spend every last dollar you take in and when you need to pay the lights or fuel the tricks we've got your back"
Your COA (chart of accounts) will consist of the income, expenses, AND assets you will record on the books. Even though you pay no taxes you are still required to capitalize and depreciate large purchases over time just like a for-profit entity. Look at the accounts you have used in the past on any forms you have filed or your annual financial report to the board.
A sampling of expense>
utilities, phones, 2-way radios, oxygen, fuel, water(unless your municipality donates the water) foam, small tools, mortgage interest on buildings, interest on capital purchases