To create a design, you'll need an application like Canva or Adobe Photoshop, Illustrator, or InDesign.
To create printed materials, you'll need print specifications and a quote. (While you'll also need a design, this is addressed in a separate FAQ.) For print specifications, you'll need to know the size of your product, the quantity or print run (how many copies you'd like printed), whether you're printing one-sided or two-sided and in color or black and white, what kind of paper you'd like to use, and any finishing (such as folding or binding).