Good Morning,
If you want to learn about Mikrotik and VLAN
I recommend the Forum-Bible -->> http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
But i am not sure if VLAN will solve your Problem…
We need more information about your Network
Is the RB750 the only Network-Device?
Are you already using VLAN’s in your Network ?
where does ether1 (port1) connect to ?