Welcome to the fun!
The first thing I would do is ensure I use the safe mode button on winbox (top left). It allows you to recover gracefully when you put in config item that causes the router to burp. Just hit reconnect and it brings you back to where you first enabled safe mode. The trick is to make a change, wait 10 seconds, if nothing happens undo the button and reapply the button, (saves the change and puts you back in safe mode). Also do not change the default fire rules no matter how many youtube vidoes you watch. Keep them until later until you know far more…
Now read this article to get you on the right track for vlans.
The intro is good and your device is covered starting at #3.
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1