All the answers here are good. In addition to these, since you are new to Arch, I highly recommend that as you install things, you keep bookmarks or print the instruction pages to pdf files for future reference. I have hundreds of pdf pages with docs that are crucial to my success with Arch. Arch Wiki is your best friend when it comes to installing.
Now, for configuring X, what kind of video card do you have? I have an Nvidia GT 435M, so here are my X configuration methods:
xorg:
https://wiki.archlinux.org/index.php/Xorg#Installing
nvidia:
https://wiki.archlinux.org/index.php/NVIDIA#Installing
Dbus (required before you install Gnome)
https://wiki.archlinux.org/index.php/D-Bus
Gnome:
https://wiki.archlinux.org/index.php/GNOME#Installation (when you get to the part where you add to ~/.xinitrc, I didn't use exec ck-launch-session gnome-session - I just used exec gnome-session. Also, I didn't install gdm - I just use startx)
Also, you may learn to LOVE pacman:
pacman -Ss search package name here
pacman -S InstallPackageName
pacman -R RemovePackageName
pacman -Syu <-- synchronizes package databases and updates packages.
Good luck!