Hi
In brief you need to
1) enable IGMP snooping on all the relevant catalyst switches.
2) If you need to route multicast traffic between vlans then you need to
i) turn on multicast routing "ip multicast-routing"
ii) Enable PIM sparse or dense mode on the vlan interfaces that you want to route between.
I would go with dense mode to start off with to test as with sparse-mode there is additional config.
HTH
Jon