also, should I just bridge ether2-6 and not bother with a switch for the AP's (I read not to use the RB as a switch)?
Unless I'm mistaken the RB1200 has a switch chip, so that should work fine. Don't bridge, though. Use the switch chip. I think (not sure, don't have an RB1200) that you can only group 5 interfaces into a switch group. I'm assuming that you can do that to ether2-6 but you might not be able to. If you have to use different ports replace as required below. The code below is from memory. You might have to juggle it about some.
For the implementation: turn on the switch chip for ether2-6, with ether2 being the master port:
set ether3 master-port=ether2
set ether4 master-port=ether2
set ether5 master-port=ether2
set ether6 master-port=ether2
Create two VLAN interfaces for VLANs 20 and 30 on the master port, and assign them IP addressing:
add name=mgmt interface=ether2 vlan-id=20 disabled=no
add name=hotspot interface=ether2 vlan-id=30 disabled=no
add address=192.168.15.10/24 interface=mgmt
add address=10.0.0.1/8 interface=hotspot
Presumably you will want to keep Hotspot customers from accessing the APs, so make you create firewall filter rules blocking packets from being routed between those two VLANs.
That's it on the RB1200. Then on the RB493s I'm assuming you'll use ether1 for the wired connection to the RB1200. That will require two VLAN interfaces. One gets the IP address for management, the other one is simply placed into a bridge together with the radio.
add name=mgmt interface=ether1 vlan-id=20 disabled=no
add name=hotspot interface=ether1 vlan-id=30 disabled=no
add address=192.168.15.1/24 interface=mgmt
add dst-address=0.0.0.0/0 gateway=192.168.15.10
/interface bridge port
add interface=hotspot bridge=hotspot-bridge
add interface=wlan1 bridge=hotspot-bridge
That should get you up and running. Again, might contain errors.
Specific answers require specific questions. When in doubt, post the output of "/ip address print detail", "/ip route print detail", "/interface print detail", "/ip firewall export", and an accurate network diagram.