I will be going now, But before you deal with wiring it figure out the specifications of lights and emergency lighting.
Whether your lighting has only one mode or multiple.
Are you dimming, going smart or switching more lights when brighter s needed
In general in restaurants you don't want lighting to be too strong, for people sitting, while you might need it stronger latter for cleaning.
Consider The entry and exit route of the staff needing light.
Type of the area where premises are located. There are areas where you want to keep switches away from pesky kids messing about, while in another areas this isn't a problem.
only then you need to consider actual wiring.
As of changing rooms toilet, think of light switches as safety and maintenance only, do not expect customers/guests to look for them/use them. (sensors are common, but cause trouble in toilets) so check the diference between PIR and occupancy.
Deal with these things first, wiring will be the easy part afterwards