Okay, you've got a career goal. Let me offer some advice...there are at least two general areas you need to get a lot deeper/knowledgable about: taking photos/creating photos and then the profession of photography as a business.
As for taking photos, others (like Gavjenks and Judobreaker) have pointed out, the D7000 is going to be more than fine for where you are right now. YouTube is a start but it's nowhere the best resource for learning how to get better at this. Willing to expose yourself to criticism and feedback is critical--you can't grow as an artist and professional unless you're willing to hear (and learn) from comments other than compliments. Look at how you learn best....books? classes? video? If you're really a video person (I'm not--I learn better from books) then check out
Adorama TV...lots of very short, practical videos on a range of subjects and Bryan Peterson is a great guy...if you like his videos than you'll want to check out some of his books. But the other thing is to start giving yourself assignments. Give yourself a shooting assignment each week. Maybe this week it's to shoot using DoF. Next week it's to shoot using negative space. Maybe the week after it's 30 different perspectives (without using photoshop) of a common household object (like a pencil). The week after it's maybe shots that convey movement. Don't just go shoot (though that's a good thing to do), give yourself a focus and an assignment to judge yourself against.
Second, there are plenty of people who produce great photos who don't cut it in business. So you need to learn about photography as a business. For instance, in my experience, almost every successful pro is someone who has a niche. I know of a couple of very successful wedding photographers and 80-98% of their business is nothing but weddings. I know of two photographers who make livings shooting nothing but pets (and not just pets, one is nothing but agility competitions and pet portraits). Another photographer who specializes in office space and architecture. Another who has a business (with a bunch of subcontractors/temporary hires) shooting youth sports teams. Everyone who does this professionally will tell you that they're a businessman/woman first and foremost. So classes on marketing (not sales but marketing), business planning, taxes, the law (and how it applies to photography and a small business) are all relevant to you. You're going to need to become good at post processing (even if you have an assistant do that, you need to know enough to be able to project what can be done to a photograph, if it's savable, how time consuming it will be to edit it) for your pricing decisions as well as organizing a workflow. Whatever your niche is, you're going to need to focus on it...if you shoot weddings that you're going to spend a lot of time talking to wedding planners, locations that host weddings, caterers, tux rental shops...probably more time than you spend talking to other photographers. You'll immerse yourself in your niche so you become known as the local resource for photography for your speciality.