How to Install a SA-MP on your GTA San Andreas and How play it

Installing SA-MP

First of all all the thing that you need is having the GTA San Andreas game that you've download/install then download the game at SA-MP Official Website : http://sa-mp.com/download
Download the SA-MP client installer from 1 mirror and install the program in to your GTA San Andreas folder. you can choose any mirror of these.
When you've done download it open the application then install as usual like you install any application if you were confused about the destination folder, it mean were you place your GTA San Andreas game files is ussually correct as default.

When you finish install the program, it should place a shortcut named SAMP on your desktop, if it's not there check your GTA San Andreas directory.

 Finding A Servers

Finding a server on sa-mp is easy just click on the Hosted or Internet tab then there you go there are many list of the Server that you could play, but there may also full and passworded servers then you need to search another server, you can also add manually to add the server manualy from add server icon tick.

 

Game Keys

As SA:MP is built on top of the San Andreas game, nearly all the keys are exactly the same as single player with the exception of a few SA:MP-specific commands :-

Key	Description
F1	Displays the in-game help menu
T	Allows you to chat & enter commands
Shift	Select a class while at the class selection screen (or press 'SPAWN' button)
F4	Allows you to reselect a character (on death)
F5	Shows the network data (eg: bandwidth usage)
F6	An alternate of "T" (chat)
F7	Shows/hides the chat window (Pressed twice toggles the HUD removal)
F8	Takes a screenshot
F9	Shows/hides the "death" window
F10	Hides the HUD (while held)
G	Allows you to enter a car as a passenger
H	Allows you to shoot while a passenger
Esc	Hide the chat input box (if open)

As for all other commands, they are exactly the same as single player. If you have never played San Andreas before it is highly recommended that you play through Single Player first - even if it is only the first few missions. A lot of playing SA:MP involves knowledge of single player itself, especially tasks such as driving around or looking for places to buy health/weapons.

Source : http://wiki.sa-mp.com/wiki/Getting_Started