1. Collect Information about your cutomers and their buying habits. What are the other websites they visit BEFORE they come to your website? Where do they go AFTER they visit your website?
2. Leverage Google Analytics to find out what are your existing traffic sources, what are the keyphrases through which people land on your website and what are your top exit pages (Any pages with a high exit rate indicate scope for improvement). Compare traffic from keyphrases with overall search volume for those keyphrases. What % of the keyphrase search volume does your website get. If it is less than 2-3%, you are probably not on page 1 for that phrase. If that phrase has a high commercial intent e.g, buy electric guitar melbourne, then use Google Adwords to quickly boost traffic and simultaneously use SEO to drive long term traffic on the phrase.
3. Submit your website to ecommerce directories like Froogle and product review sites visited by your target audience. This will give an INSTANT BOOST to your traffic.