This is an old message, but I am new here so will reply. In order to make pictures and advance your ambition, you need the right mix of equipment to make your images. In my book, that means to purchase an adequate array of equipment of a good quality level that you can afford now, start making pictures, and if you really do want to become professional, upgrade gradually as you can justify from your photographic income. Plenty of fine pictures are shot with Tamron, Tokina, and other non-Nikon brand lenses. The best (is Nikon the best??) equipment won't make good photographs if the person behind the camera lacks skill.
Happy shooting. Caruso