New User - block all allow all only from 2 IP addresses

[Steve Frazier]

I come from iptables (didn't know it well but enough to get by).  I am trying to learn firewalld now which appears to be much more powerful.
First of all I need some help, please.
I would like to remove all the rules and zones since I have probably messed up my installation so far and do the following:
I would like to "DROP" all outside traffic I would then  like to  only allow all ports from (2) two IP addresses.
Could someone explain to me how to do this.
My configuration only has:
(1) one public IP Address (ens3)
Thanks in advance.
Also, is there a good tutorial that would walk me through learning firewalld?  Thanks again for this as well.
Have a great day.