A good option would be learning from the experiences of others.it may give you an idea on how you can start and eventually grow your business.
And not just by learning from other experiences but you have to do your own research too on how you would grow your business and one of it is by knowing how to market through internet. If you notice if you'll come across search engine which is the most popular "google" it has millions of generating ads everyday and those are the way companies are advertising themselves.