It appears to have a low profile design and 1 available PCI-Express graphics card slot.
The power supply is non-ATX style which means you will be limited to what you can find that fits.
My recommendation since this doesn’t carry an ATX style power supply bay is to avoid this if you do any sort of gaming in Direct X 9 or above, as the integrated graphics are going to be weak, and you are extremely limited to a low power consumption graphics card with the stock power supply.
That being said the ATI 5550/5570 would be a good candidate if you ended up being stuck with this rig and needed more robust graphics with low wattage consumption.
Overall manuals page including quick start guide, warranty, setup poster, etc. NightGhost’s direct manual link above to the “Getting Started Guide” I’m guessing should be sufficient for most of you.