Hi there, @TylerConveyor,
Thanks for providing additional details about how you want to print the checks.
QuickBooks Online does not currently support printing checks on blank check stock. The software only supports Voucher and Standard check styles.
In your case, you'll need to use third party sources, such as MultiChax and VersaCheck Gold.
To find out more about this, you can check this article: https://community.intuit.com/articles/1145805
If you have additional questions about printing checks, I'm here to answer them however I can.