Hello. I am Ibrahim.
I really need to know how to build a render farm?
What do I need for this? And what is the best way to do it?

A render farm for what?
Please specify at least the software you need the render farm for.

Ibrahim, there are more aspects of building a render farm.
1. ) Installing and managing the rendering software. Here you should specify what 3d animation software are you using.

2. ) Building the hardware network with a predefined budget, available space and wattage. Here we need to know all these parameters to help you.
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Andyba, 3d artist
skills: 3d modeling, texturing, rendering, 3d character animation, compositing
3d software experience: 3ds max, Maya, Softimage XSI, Deep Paint 3d, Body Paint 3D, Wings 3D, Z Brush
2d software experience: Adobe Photoshop, Adobe After effects, Macromedia Flash, Freehand

I am interested to know everything about building a render farm starting with buying and setting up the computers and ending with installing and managing all kind of rendering software and rendering jobs.

A render farm is basically a cluster of networked headless servers(computers without a monitor) that do a dedicated job of rendering 3d animation frames. They do this through the help of a job queue manager,(backburner for 3d max & maya, renderpal,dealine etc are more advanced queuers with more options like bucket rendering. Its sole is to create a pool of computers that will simulate a single computer rendering your scene/s.

I am also interested in creating a render farm.. pls help

Do not build a render farm.. unless you want to buy a shit load of computer and spend a lot of money. If you do not have contact to get some job from it, you will loose all the money. Why? because you need to get upgrade of software and computer faster than you think. So , really, think about it .

RenderFarm, do you have any alternatives to building a render farm for a small studio?

There are linux render farms where you simply create a cloud for all kind of calculation including rendering. Of course you will not be able to use 3ds max on it. But most high end 3d animation software like Maya for linux, Houdini, Softimage and Blender will do.
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Andyba, 3d artist
skills: 3d modeling, texturing, rendering, 3d character animation, compositing
3d software experience: 3ds max, Maya, Softimage XSI, Deep Paint 3d, Body Paint 3D, Wings 3D, Z Brush
2d software experience: Adobe Photoshop, Adobe After effects, Macromedia Flash, Freehand