Hi there, @completebooks.
The option to write checks using a blank check stock isn't supported in QuickBooks Desktop. However, you can use pre-printed checks to print it.
Let me provide you this link where you can order them: https://intuitmarket.intuit.com/
In addition, you can go to your bank and ask them if they can provide you pre-printed checks.
You can check out this article to know more about the process when printing checks: Create, modify, and print checks.
That's it! Please let me know if there's anything else I can do to be of assistance. Wishing you and your business continued success in all that you do.