Creating VLAN??

I want create VLAN on routerboard 750G. I ll put network cable on 1st port, and to 2nd and 3rd ports will be connected to different switches. And i want to share this connection (which is on 1st port) with 2nd and 3rd port. Could you please how to create this VLAN step by step.

for example

/interface vlan
add arp=proxy-arp comment=“” disabled=no interface=ether5-local l2mtu=1520 mtu=1500 name=“opera vlan” use-service-tag=no
vlan-id=2
add arp=enabled comment=“” disabled=no interface=ether5-local l2mtu=1520 mtu=1500 name=“office vlan” use-service-tag=no
vlan-id=3
add arp=enabled comment=“” disabled=no interface=ether5-local l2mtu=1520 mtu=1500 name=“hotspot vlan” use-service-tag=no
vlan-id=4

and follow ip addresses, dhcp, etc etc

guys whoever is online here please i need help. I dont know anything about routerboard. this is my firstime.. please help me out.

http://wiki.mikrotik.com/wiki/Manual:Interface/VLAN#Setup_examples