If you’re still at the stage where you’re asking how to get into it, you don’t know enough to get into it, basically, yeah, don’t rush into it.
Best way to Get into any carrier is to go and work for a company for a couple of years whose is already in this field first understand the full functioning learn what works and what doesn’t. Learn from their successes and their failures so that you don’t end up making the expensive mistakes.
There’s probably not many classes on running a hosting company, but a best way to get start in is at your own place setup a Linux box at home. If you’re on broadband, put a Web Site on it.
Try to keep the box secure, up and running, and quick. Try to hack it from another machine on your LAN to try and keep it secure.
That’s about the cheapest way to learn how to do it without making too many costly mistakes. Because if you go out and lease servers, or and all your clients’ sensitive data (credit card details, customer databases, etc), fall into the hands of somebody malicious, you’re the one responsible, and that gets REAL expensive in court.