You can add all this to /etc/rc.local
file to get it executed on server start-up. Create your own AMI and start your auto-scaled instanced with this AMI.
e.g.
/sbin/iptables -t nat -I PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080
/sbin/iptables -t nat -I PREROUTING -p tcp --dport 8085 -j REDIRECT --to-port 91
/sbin/iptables-save
/path/to/tomcat/bin/startup.sh
/any/others/script.sh