As a new to print guy -- I also came here looking for the quick answers or easy answers. It is not going to happen as you will have to earn your stripes first. My thoughts are if you were really serious about it, you would have done far more research before coming here and asking away.
Severely limited knowledge--- the whole business model is based around ones knowledge of how to do things -- it sure is far from "simple enough to buy a machine" and be a business -- even the machines need self maintance and if it is acting up or how to fix adjust it. Simple things like printing and letting it outgas will cause you woes, how can you justify charging a customer (what you should) a fee if you don't know how to do it.
Work with someone for while who has the machines and know how-- soak it all in and grab $30,000 :0)
good luck in your endeavor,
Markus