Advice Wanted Please For Higher Search Engine Ranking

Hi all

I would just like to ask for some advice to try and get some more backlinks to my site to hopefully boost my search engine position higher. I am not an internet marketer or anything or don't sell any products etc, but simply want to promote my construction site further where I provide a service.

At the moment I am doing OK, as I am on the first page of google for all my keywords that I am targeting but I am not NO1 and would like to try and reach the top position if possible.

I also have a blog for my main website and try to keep the content updated every other day and also submit some articles to a few directories, Ezine, go articles and article dashboard.

I have just bookmarked some of my posts with a couple of social bookmarking sites and was wondering if doing more of this would help my search engine rankings.

I was just going to do this manually to 3 or 4 sites perhaps. Please can someone advise the best social bookmarking sites to target. I am not bothered about getting lots and lots of traffic unless it is targeted traffic and from people who live local to my area as I only provide my construction service locally. I am really after higher rankings in google.

Any advice on how to get to NO1 on google appreciated.

I am currently ranking between no 2 and no 8 for all my main 6 keywords.

Thank you