If your still interested in compiling Xorg from source then I would recommend reading about it in the blfs book located at http://www.linuxfromscratch.org/ it has some useful information on the subject. I can tell you tho from personal experience that compiling Xorg now that its all split up into different tarballs is not for the faint of heart. Its long and can be problematic if you don't create some helpful scripts. Also blfs will show you the basics but not walk though the entire setup so there are places where they assume you know what to change in the script they setup.

Ok, but still I have no answers.
WHAT PACKAGES DO I NEED TO BUILD MINIMUM X SYSTEM.

xf86-video-vesa xorg-docs xorg-fonts-100dpi xorg-fonts-75dpi xorg-res-utils xorg-server xorg-server-utils xorg-twm xorg-utils xorg-xinit xterm xf86-input-mouse xf86-input-keyboard

These are the packages the are in Arch's xorg group and the input drivers you're most likely to need, which should be pretty much the minimal you'd need. Depending on what graphics card you have you'll probably want to install drivers for that, but even without that the vesa driver should at least get something working. Also if it's a laptop you'll probably need other drivers to get the touchpad to work.

If you download these packages off a mirror you can install them with pacman -U[list of all file names].

I think you are missing quite a few of the supporting files needed to get x working like all of the libraries and such.

If you're referring to me, yeah I didn't account for the dependencies which now that I think about it get kind of complex. If the original poster wants to deal with that manually, you can look at the dependencies for all the packages through the arch website. But like has already been said it's probably a lot better to try and work out why internet isn't working first, since then you can just let pacman do all the work for you. That is what it's designed for, and is intended to have some kind of net connection.