When designing artwork to be commercially printed, do not use software such as Microsoft - Publisher, PowerPoint or Word
While Microsoft software is capable of creating layouts for leaflets, newsletters and similar items that will print on your desktop printer, it is not a professional design program. It is also not designed for creating documents to be used in commercial printing.
It is possible to design your own artwork, but you need to be using professional design software like Adobe Illustrator, Adobe Photoshop, Corel Draw or similar.
You also need to take into account the format that the printer will require and also other design requirements like document bleed. Most printers will require at least a 3mm bleed to all sides.