Handing out physical flyers is still a tried-and-true advertising technique that works for all kinds of businesses. From real estate to fashion, you'll find several customizable designs for a variety of needs.
In Illustrator, you can design patterns, complex graphics and work with type. You can learn to design printables fast with the Basic Printable Design Course from Printable Crush. Illustrator is a highly in-depth program, so taking a course is a quick way to learn the basics.