If you are asking for an X360 version, it is not possible.
But for the PC if you go to where it is installed you will find a folder called Data, put your mods in there. for help loading mods, use Fallout Mod Manager, because certain mods require other mods to launch first.
E.G. A companion mod i made, called 4 New Companions, that had to be loaded after RRcompanionVault.esm
Chat with our AI personalities
You have to download the mods from the internet onto a flash drive and download the mods to the game you got them for.
First off the G.E.C.K. can only be used on The PC and you will need the fallout 3 game installed to use it combine the G.E.C.K. and softwares like blender or 3d max to create good mods and what not the geck is a item in fallout that can only be used on a quest
i think on xbox live you can get these thing called garden of eden pack or something it mods stuff but i don't know if you can only get it on PC
Unplug your hard drive and put it in your computer and get mods for minecraft
fallout 3 psp??????