hello people

any suggestion on adding to my iptables script ? my current script is quite crappy but it closes ports i will post my current script and you can make suggestions to add to it if you feel like it

#!/bin/bash
./iptables -A INPUT -p tcp --dport 111 -j REJECT
./iptables -A INPUT -p tcp --dport 515 -j REJECT
./iptables -A INPUT -p tcp --dport 6000 -j REJECT
./iptables -A INPUT -p tcp --dport 32768 -j REJECT
./iptables -A INPUT -p tcp --dport 32769 -j REJECT

all im doing is closing open port so any suggestion on stuff to add to this ?