To fill out a check register, you first need to record the date of the transaction. Next, you need to record the name of the bank where the check was written. After that, you need to list the name of the person or company who received the payment. Finally, you need to list the description of what the payment was for (e.g. rent, inventory, etc.).
You should also include the category of the transaction (e.g. income, expense, etc.) and whether it was a withdrawal or payment. You can also include a column for the balance at the beginning of the accounting period. This will help you track the changes in your account balance over time.