[Senkusha]

Are you new to GURPS (like me)?  Here is the official free primer issued by Steve Jackson games.  Give the game a preview and see if it's your cup of tea!

If you decide that GURPS is for you, then all you need are the two basic books:  Characters and Campaigns.  Note that there are dozens if not hundreds of additional supplemental books available to fill just about any niche genre of gaming!