Open a new document 3″ x 3″ [This creates a fairly large check. For a smaller check, open a smaller document. Repeat until you get the size check that you want.] The Background Color is White at this point.
Be sure that both the Tools Panel and the Layers Panel are open [Go to Window along the top, Click Layers and Click Tools]
Create a New Layer by Clicking on the word Layer on the same top bar. From the drop-down menu, click New
Go to the word View on the top bar; and click Rulers, Snap, and New Guide, Select Vertical Guide. Using the ruler to assist you, pull the vertical guide to the middle, at 1.5″ Create another New Guide – Horizontal – and position it at 1.5″
Using the rectangle tool and fill color as black, create 2 squares as shown
Using the rectangle tool and fill color as Orange # ff4500 create 2 squares as shown;
Push the Horizontal and Vertical Guides away from the tile and greatly enlarge it to be sure that all 4 squares meet completely.
Go to the word Edit on the upper bar. From the drop-down menu, select Define Pattern. A dialog box will appear; and you will name the pattern.
Open a new Document 12″ x 12″. Go to the word Edit on the top bar – Fill – Pattern