I would suggest that you get training in business, photography and maybe journalism. If you want to have your own business, then you should understand what it takes to run a business. Running a business is not a function of your ability as a photographer.
Take some journalism courses - learn how to follow, develop and report a story. As photographers we are essentially storytellers - learn how to write, it ain't easy.
Take varied courses in photography, just to get a handle on technique. Remember, there are formats out there that could serve you just as well as your Pentax digital. (Think MF and large format film/digital) There are schools/workshops that teach studio, landscapes, portrait and other types of photography - look for them. Look for grants and sponserships to further your studies.
But remember, when you do get "out there", this will not be a hobby. You will have to grind away, work for people you do not like, work in places you do not care to be in, sweat the details and you have to get up in the morning and do it. No excuses, no mommy to get your breakfast ready, no paid holidays and no summers off. Your work schedule just might be working every normal Holiday that others have off - you will be working.
Now I hate to quote Mr. Rockwell - for several reasons - but he does have some good points here:
How to Become a Professional Photographer
Some of the stuff he says is pure bunk (don't go to schools etc.) but there is some truth in what he says.
Remember, unless you are very-very good, your "Art" will have to wait. The babies, pets, brides, gardens, cars and other people will have to come first.
The Elitist - formerly known as PDL