Do i need a licence to have fire breathers outside a club?

That would be up to your local municipal codes. You should check with the city to find out and you could possibly apply for a permit if they require such a thing for a firebreather, but on the other hand you could just get a 'no,' at which point you'll be in trouble. If you don't ask you can plead ignorance if there is a code against it, which may or may not work.