I didn't have Cpanel installed. I was trying to point a similar name domain to the server (error #1

). I believe it failed cause I didn't have Plesk installed to host multiple domains (error #2).
So I had it installed and am able to resolve multiple domains (up to service plan) to the server now

.
I'd have to look at Cpanel again, but to me its looks like Plesk operates at an enterprise level. So it can be a little intimidating at first.
Not saying its harder, just different.
Example, and correct me if it is in Cpanel..
For domains, In Plesk you can create client(s), and under each client you/they can create domain(s).
If I recall in Cpanel, you only create domains for whom you're logged in under(?) No option to create clients etc..