What is the best way to get my billion dollar business started?

I have a great idea for a business but i dont have any money for a lawyer to get a patent or to invest into the business. I know for sure that the idea could generate a billion dollars as a company but how should i go about getting the money to get the business started. I dont want anyone to steal my ideas that is why everything is a secret right now. i want to hurry up and start the business before someone else thinks up the idea and beats me to it.