electrical help need advice

[Kracker Jack]

So im fairly familiar with marine wiring........Fairly.how do I know what amp I want to run on each switch? is there a formula? and also lets say im running multiple lights on one switch, would I connect each light to one terminal and then run a single wire from the terminal to the actuall switch itself? all advice, tips and short cuts are welcome. and maybe elaborate on what gauge wire I should use to run my lights and other electronic items.

Just to let you guys know im going with a dual battery setup with a 1-off-2-both battery selector. The electronics will be protected by a sea sense 10 position fuse box. Heres how i would like my switches

#1 switch type- (on-off-on) running lights (all around light, 2 seperate red/green bow lights,stern light,compass light,tach gauge light)

#2 switch type- (on-off) all electronics kill switch (vhf,gps,stereo)

#3 switch type- (on-off) courtesy lights (t-top leds,bilge leds, 2 side console leds)

#4 switch type- (on-off-on) led accent strip lights under gunwale (2 cool white 16' continues led strips, 2 blue 16' continues led strip lights) note-I will have the option of using just the white leds or using just the blue leds, never both at the same time.

#5 switch type- (on-off) deck level sump well bilge pump with float switch (I will have a 1100 rule pump with a float switch option that will pump deck water over board Im gonna use the switch on the panel as a kill switch when not in use)



#6 I will have a seperate (manual- automatic) rule bilge switch constant to the battery for my true bilge pump(2000 gph)


am I missing anything?