Firstly pick a subject that YOU KNOW - a topic that pertains (nice word that!) to your area of business. You are "expert" in it.
My advice is just find your "natural style" by writing as youspeak - as practicing writing in your "natural style" breeds confidence. Then submit your articles to ezines and announcement lists, like Article Announce, Free Content, Publish In Yours and Article Publish. I find this marketing method by far most effective means of getting traffic to our various sites (and one thing then leads to another)... and best of all it costs nothing, but a little time and effort! Lately, all our marketing has been done through writing articles (on internet marketing, writing, money and self help) and submitting them to article announcement lists, like Free Content, Publish in Yours, Article Publish and Shelley Lowery's Article Announce. Often from there they get picked up by ezines with large readerships - from 10000 ...to even ones with millions of subscribers. True! These big ezine publishers are continually looking for new and quality content, particularly ORIGINAL material that can help others.
My advice is... Write about what you KNOW - your areas of knowledge and expertise, based on your experiences. We find this strategy of SHARING relevant and practical information most effective of all in drawing traffic to our various web sites... and best of all, it helps others "out there in vast void/realm of cyberspace". That is one of reasons why I write my various articles.
Here are some other points in writing articles for www:
* Identify your target audience.
* Keep your title reasonably short* *.
* Keep your paragraphs short.
* Get to point quickly (enough waffle with maple syrup, Craig!).
* Target your article to your audience with "focussed information".