If you want to start marketing your website through different social book marking sites, you first need to upload useful content on your website which beneficial to your users in certain terms and then share that link to book marking sites.
Remember never share content like discounts or sells to specific products instead share something useful relevant to that products. Suppose you are selling computer parts, you can share content like " How to format computer" or " how to check quality of specific part" instead of sharing content which appeal for sale.
Yes, useful content is always a key for success of your website and make sure content should be fun to your target market not boring or vague.
Social bookmarking help you to get increase the website visitor. It also help you to get a good quality of backlink. These backlink increases the website ranking up over search engine website. It also helpful to get indexed your page over search engine website.
No doubt that Social bookmarking is excellent link building technique but in this technique quantity also matters as well as quality. Social bookmarking is fruitful for ranking as well as traffic for a website.
Social Bookmarking submissions will provide you with high quality one-way links from social bookmarking websites, which will result in a higher amount of traffic coming in, but you need quality bookmarking sites so that the traffic is relevant. here are a couple of ideas:
http://www.digg.com
http://del.icio.us
http://www.propeller.com
http://myweb.yahoo.com/
http://www.google.com/bookmarks/
It's quite easy to get started with social bookmarking, just Google and get the list of the social bookmarking list (try to find the large ones with high PR first), then you can start submitting just by yourself. This will be the most safest and low-cost way to do social bookmarking because all your submissions are manual and natural, and all you need to pay is your time.