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

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.