You might want to do some extensive research about hosting before attempting to start your own company. You need to understand the industry and be familiar with certain aspects of it before you get very far.

To answer your question, lease a dedicated server from one of the many companies out there. From there you can sell accounts. I lease from liquidweb.com, which is kind of expensive but a good service.

IMO, you don't sound ready to start a company, it takes a good business plan to be successful. Hosting is a very competitive industry, be careful.