It is not clear if you are using your first router as an access point only or you are using it as a router as well. It makes a difference if you will be using more SSIDs and you want them to be in separate VLANs.
Here are a few ideas from me:
- at the beginning focus on only one SSID and enable local-forwarding.
- on the first router setup the CAPsMAN.
- reset the configuration on the second router and select the CAPS mode from the reset menu.
- configure the first router to be also managed by the CAPsMAN meaning that the router will manage its own wireless. Check this http://forum.mikrotik.com/t/capsman-manager-cant-manage-its-own-wireless/113821/1