Where can I splice wire for power to new lights?

[Tonys]

I have a 2007 Utopia 205 and want to add some lights, an underwater light in the rear and lights in the air vents. I want to add 2 switches on the dash, I would like to add switches that match the existing ones but there’s it enough room so I’m going to add some small ones. Where can I get the power from? I would like to connect to the existing fuse box but I’m not sure which wire, I would add a fuse for each circuit but need a power source. I want to find something after the battery switch so it can’t e left on once the battery switch is off.