Can you give specific sites where i can find oratorical declamation pieces?

You should write it yourself, especially if it's for, say, a contest on the 28th in Karachi, at risk of being disqualified. Plagiarism is unacceptable. You are allowed to use books for inspiration and inspiration only, and not to copy out of.

I suggest you write your own speech.

the above information is incorrect. A Declamation speech is a teaching tool where the student performs someone else's speech.