Hey Paul, I am new to HubPages and by no means an expert in regards to the best medium. However, I do have a background in sales. Word of Mouth is usually one of the best forms of advertising.
If you have a Facebook and/or Twitter account, provide links to some of the articles you wrote. If others like the article you wrote, than they may pass the link to their friends, who may pass it on to their friends.. etc.
The more exposure you have the better chance of more traffic.
I hope this helps!!