Yes, you need a quick release plate for your camera (and lens tripod collars, if any). If you will shoot portrait orientation from the tripod, consider an L-bracket instead of just a base plate for the camera (yes, the ballhead has a drop notch, but centering the weight over the ball is better, and also enables you to do a pano rotation in portrait orientation).
Clicking the Accessories tab on the page you link shows the 'generic' base plates (fit any camera, you'd need the 1/4") from Arca-Swiss. But, lots of vendors make compatible plates since the AS system is 'the standard'. Check out Wimberley for a good generic plate (P-5) and lens plates for tripod collars. I like Really Right Stuff plates and L-brackets a lot - they are camera-specific, meaning no chance of the plate twisting. RRS gear is available only direct from them, though. Kirk plates and L-brackets are of equal quality to RRS, and distributed by B&H/Adorama.