May i kindly suggest reading a little, helped me so much:
Using RouterOS to VLAN your network: http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
RouterOS bridge mysteries explained: http://forum.mikrotik.com/t/routeros-bridge-mysteries-explained/147832/1
If you want to play without too many wire, use a VMBox and a Cloud Hosted Router.
(ROS as a VDI image): https://mikrotik.com/download
VMBox nettwork explanation here: https://www.nakivo.com/blog/virtualbox-network-setting-guide/