What do I have to do to legally perform on the streets of Louisiana?

I am a struggling musician. I currently live in new orleans where music thrives through the city. I want to know how or what EXACTLY i have to do to legally perform on the streets for profit like, standing at a corner with the little hat and people throw change in it while i sing and play guitar/keyboard etc. i dont want to get arrested or have in trouble with the police so what can i do or what papers do i need specifically to do such? and how to or where to get the papers or whatever from?

get a permit from the police, and lie saying its for charity