Well, I can't promise that I will completely eliminate the fears you may have about your brochures, but if you follow the tips that follow, your level of worry should be reduced somewhat.  If you consistently apply these techniques with all of the brochures that you design, you will find what works best for you.  Eventually, you may not have to worry about your brochures at all, because you will be too busy counting your money.

Search for Good Art and Pictures
Do not settle for poor quality pictures on your brochures.  It is surprisingly easy to find very impressive clip art and stock photos on the internet.  Simply do a search, and look around until you find the types of art that you are looking for.  If you spend a little time on it, you should have no problem getting some top notch photos for your brochures.

Accentuate Your Positives
Design your brochures so that your most important ? and intriguing ? points stand out.  Your primary selling point should be distinguished from the rest of you brochure by using bold print or a different color scheme.  It should usually be printed in larger text than the rest of your brochure.

Be Consistent
Although variety is an important element in brochure design, be careful not to overdo it.  Certain elements should be used consistently in your design.   For instance, if you use bullets, use the same type of bullet throughout the brochure.  Keep your colors within a reasonable spectrum; do not use a rainbow of colors on one brochure, unless that explicitly gets your point across.

Make it Easy to Read
Your goal is to make it easy for your customers to take advantage of what you have to offer.  Don't make it difficult by incorporating things that inhibit the customer.  For instance, use easily readable fonts that can be read from a moderate distance.  Keep all of your captions close to the pictures that they describe.  Have all of your brochure elements flow in a smooth and aesthetically pleasing fashion.

Stay Within Yourself
Along the same lines, it is important to avoid getting complicated.  Your readers want to see a simple, straightforward brochure that tells them what they need to know.  There is no reason to get complicated and risk losing a customer.  Use a narrow spectrum of colors, easily readable fonts, simple structural designs, and noticeable headings and subheadings.  When it comes to brochures, simplicity is key.