relay wiring

ok i dont know a whole lot about relays but i know why i need one, current draw to high for a normal switch. I need help on how to wire somthing up. what i want to do is run a 12 volt accesory and it needs to have an activation switch, and momentary push button. so i need a toggle to turn the system on and once its armed/activated (not running) a momentary to complete everything and make it turn run while the button is pushed in. sorry if the explnation was confusing if it was let me know and ill try to clear it up and thanks in advance for any help...""You're not ready for the dunes until you're sittin on phat chrome" - Pimp my ride"

ok i thought about it again and came up with this... (by the way this is for an injector that will mist an intercooler with water...) if this is wrong please let me know ""You're not ready for the dunes until you're sittin on phat chrome" - Pimp my ride"

ok thanks for letting me know that is what someone else recomended to me, i looked at it and it seemed to work, should i use your design ?""You're not ready for the dunes until you're sittin on phat chrome" - Pimp my ride"

ok so what would i need to change for mine to work?""You're not ready for the dunes until you're sittin on phat chrome" - Pimp my ride"