Please help me to use oAuth as i need to pull tweets for one pf my projects. I neither have website nor an app .
You already asked this once. Please do not open multiple topics for the same thing.
I linked you to a very excellent documentation of oAuth, if you are unable to understand, I doubt that any description given here will change this, as it would probably be less verbose than the docs. If you have problems understanding oAuth in general, you might want to Google for some resources about that explain oAuth 1.0, but this is a bit out of scope of the Twitter API but rather a general oAuth related problem, which has nothing to do with Twitter in particular.