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Signature for twitter app

I need a signature for my first request to twitter :


My code create a Post request to this end Url https://api.twitter.com/oauth/request_token and I have to set a header which is mention below in which I


need signature.


I have only call back Url, consumer_key. I have created nonce and timestamp. I need signature


Authorization Header:
OAuth oauth_nonce="XXXXXXXXX", oauth_callback="XXXX", oauth_signature_method="HMAC-SHA1", oauth_timestamp="XXXXXX", oauth_consumer_key="XXXXXX", oauth_signature="HOW I CREATE THIS", oauth_version="1.0"

urgent for me. 


How to hit first request I also want to know?