I'm facing that issue almost every day.
You start of with the basics;
Submit your sitemap to Google.
Get google analytics.
This is so that you can track your hits, and to make it easier for google to find you (you worry about bing, yahoo and ask a bit later on.)
Now, you have two options. White hat or black hat.
Here's how I'm mixing it.
I have a couple of autoblogs. Each with something related to my e-commerce niche. Mention your e-commerce store (not
http://linktosite.com, but a unique product) once a day, per blog.
Post at least 3-4 times a day, use Wp-robot or something similar. Don't forget to submit the sitemap to google. And, be smart and don't have your analytics account associated with your auto blogs.
If you put some manual work into it, such as rewriting the posts, it would be better. But we're after PR and posts - not actual readers.
To increase the linkbacks, have a company blog (e-commerce blog), which is related to your products, your company and the whole niche-lifestyle. If it's for baby bottles, then write about parenting etc. It's beneficial for your company - because costumers appreciate companies that are transparent.
Submit articles to 2.0 properties.
Use some scrapeboxing. But only for your auto-blogs.
Hope that helped a bit
