When it comes to creating sales flyers, the rule of thumb is to Keep Things Simple!
Many people make the common mistake of adding too many shapes and elements that make their sales flyers hard to read. In general, people who read flyers scan from top to bottom. From my experience, I discovered that they look first at the headline, followed by the illustration, then at the body copy.
With that order in mind, design your layout in blocks. This means placing the headline, illustration and body copy in a blocked layout on the page. Start by putting your headline at the top, illustration under the headline and copy under the illustration. Remember to put a caption under the illustration as well. Write your caption in present tense and include your brand name and offer (“The Victorinox Huntsman Pocket Knife is available to you at greatly reduced prices when you shop at XYZ store”). Wherever possible, maximize your layout and don’t leave too much empty space on the page.
If you don’t have good artistic ability, then I suggest that you hire a graphic designer to do it for you. You can hire a professional designer, which costs more, or pay a student who is willing to help you at an affordable rate. It’s up to you.