OK, now you have basics working. If you want to add guest wifi network, then you’ll have to add VLANs into the game. And that will involve: CAPsMAN device, all switches, main router and optionally CAP device. It seems that you have one switch which is CAPsMAN as well (so that brings down number of devices to reconfigure, the complexity remains the same though), and CAP device is listed as optional, depends on how you want to use its wired ports (if you’ll only use one port to connect it to switch, then you don’t have to configure VLANs on it, you have to make connecting port on switch a hybrid port - allowing both tagged snd untagged frames - untagged for VLAN where CAPsMAN discovery works, VID 4 in your case). If you want to use other port zo connect any end equipment, you’ll have to configure VLANs on CAP device as well (but you could configure VLANs on CAP regardless).
If you’re not fully comfortable with configuring VLANs, you may want to study this tutorial: http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1