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Quality score is a calculative term which is calculated on quality of your ad content, number of clicks on the ad, type of keywords used. It is calculated by the google itself. Higher the quality score, lower the cost per click.

Webmaster tool, Informenter, Rank checker, google adword keyword tool.

Interlinking means linking one page to another page of your website. It is very useful from the seo perspective.

Digg, Reddit, Stumbleupon, Delicious. Along with this i follow the list of socialmaximizer, where lots of SBM sites are given.

You can use Rank Checker toolbar from seobook.com. It gives approximately US ranking.

Google Adwords is a advertising program run by google. Here, Advertiser promote its site through sponsor list shown on the right hand side/ above the organic results. If you want to learn more go to google learning centre.

You can target all 4 keywords on single page on the basis of their priority.