Hey Jay,
No, not 4 wires on input. For VFD input, which means wall outlet to VFD, you need a 2+PE cable, which according to Adam Ries is 3 wires. All protective earth wires of the system have to be brought together in one point which should be the metal plate as seen in the picture above (to which the VFD is screwed with its metal back, the metal plate is usually part of a control cabinet case).
yes, for the wall to VFD, a three prong plug for safe connection to your house earth, and at the other end three loose wires to which you have to crimp connectors. You should not need to solder something. The wire ends are crimped to either ring connectors or wire ferrules (dependent on the type of terminals on the VFD) with matching crimping pliers. Please avoid having the wires (which are stranded wire) without one of both, ring connectors or wire ferrules!
Jay, attempting to wire a spindle and VFD, for which a certified electrician is required, is a serious thing. Please be sure to acquire the knowledge needed before.
Please do follow the links I mentioned above and the links you find there, there is much information there.
Got to leave now! It is 06:59 in Central Europe.
PS: This is now off-topic according to your subject line. Please consider continuing the topic e.g. by joining here.