That all sounds good. Now you need to check that a gigabit connection has been established between router and MyCloud: read p11 of the user manual. You should see one steady green light and one flashing (activity) light on the drive’s Ethernet socket.
As for the cable, the one supplied is cat5e; the spec is printed on the cable, and it will be on any half-decent Ethernet cable. A short (1-2m) cat5 probably won’t be a problem.
You might want to read this:
