Whether or not someone helps you through your day-to-day bookkeeping, maintaining records of your transactions demands discipline. Why? Because all these documents allow you to justify your "accounting entries", the small lines that make up all the financial flows of your company.
Do you keep all your receipts, bills and invoices? Many of us try but not all of us succeed. The problem is, there are so many of them: bank statements, purchase invoices, sales invoices, credit card receipts, even lowly check stubs. Unfortunately, you need to keep them all as you may one day need each of these documents to justify a business expense.