Right Me and my mate need help on how to install mods with got winrar and everything but there is no folder to put the mods in ive watched all the youtube vids and stuff and they all put there in a folder but whe cant find the folder where they put it in

We Have Winrar*

It is usually C drive - games(Or Program Files(x86), where ever you installed your game) - Bethesda Softworks - Fallout 3 - Data

If the game runs there is always a data directory, even without any mod it contains the fallout3.esm and subfolders. If you can't find it make a search for fallout3.esm in the windows explorer.

When you unpack the rar in your download directory it keeps the folder hierarchy and creates the needed subfolders. So don't copy it roughly in the data folder, but only the content of the newly created directory.
Otherwise you'll end copying a subfolder named "data" in the data folder and the program will never find the mod

Read the pinned thread on Mods FAQ for info on where things go manually.

But don't install mods manually. It is just good info to know, but most people use 3rd party programs that installs mods for you and tracks things like which order they install in and gives control over your load order and many other things.

Your two main choices are going to be either http://fallout3.nexusmods.com/mods/640 or http://fallout3.nexusmods.com/mods/11336.

I very much prefer Wrye Flash (an offshoot of Wrye Bash for Oblivion) - and its installer known as http://www.gamesas.com/topic/1084204-bain-mod-installation-projects/. Many here will not agree with me, but this program is widely used and variants exist for it for Morrowind - oblivion - skyrim - and both fallouts. FOMM is a fine program and, in my opinion, the best of the mod managers - but still BAIN is what wins it for all out functionality.

You can have both programs installed and probably it is a good idea to do so, but I recommend installing most mods with only one as they work best that way.