The movie has very little to do with the game. If you want to go nonetheless, here is what you can do: stick to the community - IRL - and in case of any trouble, be it either technical or gameplay related, talk to people searching for solutions.
'S.T.A.L.K.E.R.' is a broodingly rooted PC game from the 'unforgiving' era. If so, it does not necessarily need mods just for the sake being stable, but some mods, could make the experience more absorbable for you. Make sure your version of the game - if you intend to play 'Shadow of Chernobyl' - is 1.0006.
If you are a freshman to the PC gaming world, coming from the console gaming, 'S.T.A.L.K.E.R.' will be like jumping straight into deep water, in order to learn how to swim: minority of such challengers succeed, majority unfortunately recoil. 'S.T.A.L.K.E.R.' is a very difficult game, both in terms of gameplay, as well as it is difficult as a consumer product.
