Emergency Floor Lights

Hello,

Please can someone tell me what happens during an emergency on an
aircraft, with regard to the lighting and sounds:

Do the Exit signs light up? Or are they always lit up during a flight?
Do the main cieling lights remain on?
Do the passenger lights (above the seats) remain on?
Are the emergency floor lights all one colour? or are they colour
coded in some way to guide passengers to the nearest exit?

Also, are there any alarms or announcements that are made during an
emergency?

Thanks in advance for any information you can provide.