I'm thinking of starting a holding company. I want to hold everything from shares in other companies to real estate to actual businesses (such as franchises or starting a new business and hiring a CEO to run it). While I may be young (19 years old and in college studying Finance) I still want to know how to go about starting a holding company. How would I get it set up and when going to investors for venture capital, how should I present my business plan to them?

*NOTE: I'd rather only those who have successfully started their own business and that business is still up, running and profitable to answer. I don't care what kind of business, so long as it is a registered, legal business*

Thanks in advance for any help or advice.