To connect the flood lights, I would add a separate circuit breaker for the 24 volt feed directly from the batteries. 15, 20 or 30 amp rating depending on your lights.
The reason for my relays is to reduce the burden on existing circuits. I have one relay operated directly by the turn signal flasher, since the new ones are so poorely designed. This way the flasher unit will never be overloaded and I get a full 28 volts on the turn signal lights.
A second relay is used to operate the headlights. The 3-lever light switch operates the relay, which in turn switches the headlights on and off with 28vdc supplied by a separate circuit breaker directly from the batteries.
There is also a relay to operate the selector valve for my heated fuel tank system, but that's a different story.
If you decide to use a relay, remember that a lamp filament has a very high inrush current. A 25 amp mil-spec relay can only safely handle a "lamp load" of about 10 amps.
I use a 25 amp relay for my turn signals and a 50 amp relay for the headlights. Quality mil-spec relays are always available on ebay at a fraction of the original cost.