By using YouTube, you can promote anything you want. It's either a affiliate link or your own online business or personal business. You can scoop a short video presentation showing what is it you want or telling the people that you are there and they can go to your business. At start, it is hard to find viewers and subscribers but when you are a well-known YouTuber, you can easily gain visitors to your channel. Just try to post and post new videos and let the customers come to you.