Choosing the right font is important, the typeface you select can have a considerable influence over how your message is interpreted. The right font can help warm your audience to your writing. A rigid font can suggest you interpret material more formally, there are some that can leave you cold, and some that are casual and distinctive.
Teaching students about fonts can also be very revealing. It's like owning a blue volkswagon. It's only once you have one, that you'll seeing them every day. Introducing the influence of fonts to children is powerful ... once they appreciate their impact, they'll start discovering them everywhere.
There are some wonderful places to source great fonts, and I'd encourage you to seek them out.
Da Font is perhaps one of the best, with over 10,000 fonts (yes, ten thousand) to select from ... it's also one of the easiest to navigate. Happy hunting!