I own a D50, but as good as not owning one as I don't know how to use it at all except for the menu functions and various buttons.:embrass:
For starters, are there any threads explaining on how to take portrait shots, macro and all?
Best is to join outings where you can learn from others in the field. You can ask any photography related question (sometimes non related) and will get good replies. Morever you get to try out the specialised lenses and accessories from other members before buying your own. eq Macro lens.
I learn a lot and still learns from outings. However, beware of the BBB virus.
Best is still to go out and shoot more, cause you already know how to operate the camera. Shoot more, review and see which photos you like and don't like. then ask and find solutions. Reading books from the library or search the internet only give you theory. Practise makes perfect.