how to wire lights through key

[96clubber]

i am looking to put my lights on my key switch. I am tired of my outside cats jumping on it hitting the lights on and when i want to take a ride guess what battery dead. Is the key switch strong enough to handle lights and eventually a radio. what is the easiest way to wire this up so i dont have constant power at all times to the lights. I just want to hook them up to the key so that at least has to be on....