Adwords Quality Score from 7 to 10

I currently have an Adwords quality score of 7 on all my keywords in the campaign. I understand a quality score of 10 will allow me to pay less and keep good positions. I need advice on how to obtain a quality score of 10 and how to continue to pay the least amount for the best positions. I just had my new sites xml sitemap uploaded to google webmaster, so the 7 might have to do partially with google not crawling my site yet and seeing relevant keywords. Thanks!