How do I enter written and uncleared checks before we started using QB

I'll be your guide on how to record transactions that are made prior to using QuickBooks, jmarx.

Just to make sure that the dates are correct so the transactions are reported in the correct period. Here's how:

1. Click the + New button in the left-hand side of QuickBooks. 
2. Select Check under the Vendors section.
3. Click the drop-down list for Payee and look for the vendor.
4. Go to the Payment date field and select the correct date.
5. Enter all other details and click Save and New.

Repeat the same process for the rest of the checks.

You can also run an expense report to verify if all outstanding checks are already recorded. Here's a video guide on how you can open the report: Track What You've Spent Using An Expense Report 

Reply to this if you have follow-up questions with regards to recording past transactions.