i'd talk to your friend about this first, honestly. don't put the cart before the horse. perhaps he considers it his business and considers you a friend who i

i'd talk to your friend about this first, honestly. don't put the cart before the horse. perhaps he considers it his business and considers you a friend who is doing him a favor before he hires someone serious. perhaps he's just tapping you for ideas/help and not planning on compensating you. etc.. define what your role is and what it will be as this project turns into a profitable company. THEN decide if you're ready/willing/able to fill that role.