Good thing you already found out about VLAN1 
The basis vlan bible around here can be found here (go to section router/switch, forget about wireless in your case):
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
Read and digest.
Apply.
In case of problems, post your config between code quotes and I’m sure plenty of people will have a look at it.