Make/Model of router?
Make/Mode of switches?
Suggest having a thorough read of this article…
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
if any of the above are MT devices, then suggest you post their configs for best assistance once you have some questions…
/export hide-sensitive file=anynameyouwish
If they are MT devices and you are using the bridge construct its easy to lock yourself out so recommend you use the SAFE MODE liberally and consider configuring OFF the bridge.
https://forum.mikrotik.com/viewtopic.php?t=181718