10 Tips for better print design
With these tips I hope to help novice designers on their way to better print design. The tips are for print design in general: doesn't matter if it's a brochure or a poster or a identity. In no particular order.
1 Remember to bleed
The settings in InDesign are right there in the new file dialog… but hidden! You need to hit the 'more options' button before they become visible. If you already have a document open you can find them in the file > document setup dialog.

Is your budget limiting you to only 2 Pantone(PMS) colors? No problem. Try to experiment with overprint options to get a look with more depth with a limited color palette.
You can even work with photographs with only 2 Pantone's, just do them in duotone or monotone.
The human mind fills in gaps and will see the bigger picture if you aim for it. Using the border of your paper can be great fun and another tool to work with.

Square booklets, for instance, make for a more interesting reading experience, while smaller sizes (A5 for example) are much easier to take with you. Fly away from that standard A4 and take some risks.
In conflict with some designers of the last 5 years I still think form follows function. This means in print design: If your working on something that contains textual content concentrate on the content.
If you have some kind of idea that there's too much on your page; there is indeed to much on your page. Define what's really necessary and remove any visual noise. It may sound cliche but it's true: less is more. If the client makes you cram too much content on one page, tell them.
Working with grids is the key to any good design. Using it's proportional relations, composition guidelines for the base of your design is a good idea.

If the typographical setup is bad, no amount of lines or other elements will fix it. The fonts you use the most in your project set the voice for it's overall feel: don't pick the first font you like; think about what voice it should have and the best way to communicate this to your target audience. You can have a lot of fun with the basic well designed fonts: Helvetica, Swiss or Akzidenz Grotesk will save you from the worst typographic horror-scenario's.
It takes a while to get to know a font. A good way to get good with a particular font is to pick a list of 5 to 8 fonts you think could work for you and concentrate on those. That's also a good way to find out which fonts mix and which won't.
9 Invert
Need to give a bigger impact to a quote or logo? Invert it. White on black (or on any dark color for that matter) will always give your design or typography more strength.

10 Be demanding about photographic content
You should always demand high quality source material to work with. When working with photographic content for example the "trash in, trash out" rule applies. A good photo can take your work to another level, a badly lit low resolution photo will ruin your work. Most clients will send you what they have for grabs… most of the time they don't understand quality or image resolutions. Bug them a bit and they'll magically come up with better material.