So aside from the GPU I would need a PCI riser with USB3 connection and some power extension cords?
But how do I mount the card unto the rack? I can't seem to find the little iron mounting bracelets anywhere...
What bracelets?
The card comes with a metal bracket, which you screw on to the frame. And you have one screw hole left on the right side.
You seem to have a free PCI-E slot on the right, but you need to check if your motherboard enables it when all others are used. If it does then a simple pcie riser would do. Else you would need a multi-port riser.