It's great that you're using QuickBooks Self-Employed to streamline the bookkeeping of your business. I can shed some light on your options for printing cheques.
QuickBooks Self-Employed doesn't offer the ability to print cheques within the program. I recommend checking out QuickBooks Online, as that program includes a number of features that aren't available in Self-Employed, including the ability to print cheques. You can learn more about our QuickBooks Online plans and their features here. I'll also include the link to our Community article on how to print cheques in QuickBooks Online incase you decide to go this route. If you'd like to stick with QuickBooks Self-Employed, you'll need to either manually write cheques or use an alternative payment method such as e-transfer or credit card.
I hope this helps. Let me know if you have any other questions!