If you want to be a designer, fist thing that you should do is find the people who would be able to give you the knowledge and information to master this field. The people that can help you with the endeavor is the talented and experienced people. Try to absorb the valuable information from these people, because they have been there before and also had many experiences of real work. When you get the knowledge from those who have already turned ideas into results, you can be wiser.
Then, learn how to bring them into business. In business, it is not only your skill in designing, but the marketing campaigns that will bring the money to you. Decide about employees, overheads, costs, business presentations, and even the financial risks. You should also master the art of presenting, because as a graphic designer, you are selling your ideas to your target clients for living. So you should be able to sell your ideas to your target clients and make them love your ideas.