How do i play here? is there's a client or someting? or do u use gamer ranger?
i didn't find any guide about how to play

You don't?
I suggest you to read through this. https://www.lost-soldi...forum_topic&topic=625
Especcially the 3rd part will explain the connection between Battlefield 2 and the BF2Hub, which you need to install to start the game.
But it is well explained here: https://imgur.com/a/Bf5V0Dt

soo.... oh uh ....does it work with pirated version?

Well i prefere the word abbandonware anstead.
But yes it goes along and all works well.
If you check BF2Hub.com you find a lots of active player 24/7.
On https://bf2.tv/live you can also see active player and server.