A very good document for your reading on vlans follows.
My personal belief is that you leave capsman to the very end, it adds a layer of complication that is unnecessary while figuring out the BASICS of configuring WIFI on MT device and figuring out the BASICS of configuring vlans. Once you have both mastered, then you may decide why bother with capsman, or then be brave enough and have the ability to fall back to a working config at any time if you get stuck implement capsman. I have two capacs, and never bothered with capsman as running another process was simply not necessary and its easy to bugger up the config.
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1