Any suggestions on how can I start on these simple search utility.

Project: Search Utility (specifically video sharing scripts like phpmotion)

Details:
1. Search for different video sharing script name
2. Take the url, meta keywords and description and store it in a table.
3. Check the url's by google pr to see which is better to have links exchange.
4. Search should not be too fast to prevent being shut by google.

Question:
1. Topics I should read on how to capture meta description and keywords from a web page.
2. How will I determine a web site that its a video sharing script site among from the others.

Just a little guidance and thought is greatly appreciated.

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