#1, Do these lights get hot? is a heat sink needed? (according to the ones you're using)
Well, seeing as there is 60 Watts of power, yeah, I'd say it's necessary. High power LEDs burn out very quickly if they're not attached to an appropriate heat sink.
#2 what is meant by common cathode or anode?
Common Cathode means that all the LEDs' Cathodes (negative leads) are connected, and Common Anode means that all the LEDs' Anodes (positive leads) are connected.