If you don't already have Grand Theft Auto SA downloaded and want it I'll show you how.
First download Utorrent or Vuze (or whatever torrent engine you prefer)
Then Download this
Grand Theft Auto SA
When that is completed downloading you will need a disc emulator
I personally use magic disc and magic iso (you could use those or any other disc drive emulator)
When you have the emulator installed you will need to mount GTA ISO using the disc emulator.
Install GTA SA and play to the first mission and save it. Exit to your desktop.
Replace the GTA_SA in the game install directory, with this one
Grand Theft Auto 1.00 No CD
Then download this and install it. It's called San Andreas Multiplayer (SAMP)
SAMP
Put a shortcut of SAMP on your desktop and when you want to play SAMP click it and select server you want to join :D
I will be getting a server soon. It will most likely be later today. I work tomorrow so I can't stay up to late :P if you need any help message me.
P.S. There are no torrent links visible so ;) Don't edit my post
GTA SAMP server will be up this weekend.