Pretty much as it says on the tin. Here are the internal forms you might be looking for.
Cheque request form: to be used if you need a cheque made out to pay a supplier direct.
Expenses Form: to be used to claim reimbursement if you have incurred expenses on behalf of the church.
Cash Events Form: for organisers of events to use to show income and outgoings, used by cashier for cash deposits or treasurer to reimburse event expenses.