Keep in mind you can distribute to your friends or brew batches for them by having them buy your ingredients for you. Other than that, you can't legally sell or distribute to them or retailers without proper licenses to be a brewery.
From what it sounds like to me is that your friend enjoys your beer a lot, but have you submitted it to any homebrew competitions to see what critical judges think of your beer? Have you won any competitions or entered into any pro-am contests? That validation from judges and winning competitions will make your product more marketable, but otherwise you are wanting to embark on a long windy road that isn't for the feint of heart based off of the tastes of one friend.