Develop word press plugin

I need a plugin script developed for wordpress platform. This script must work for Post and Pages in in wordpress. The script must be able to count the words used in the post and let user know the Keyword Density of their post. The user must be able to check the post for the Keyword they insert in the side panel of post. The script will check for 9 seo things in the post and give the user feed back on the right panel on how to improve the article they are about to post. (SEO Tips). The user will be able to check the scores of each page and post in their settings tab on the left menu. Also in a the script will be a license checker for admin to keep track of the authorized copies sold from website. Which will use Clickbank API to verify receipt numbers.