Comment by smokel
I am pretty good at drawing, and would highly recommend starting with traditional media rather than digital tools.
Drawing on paper allows for a wide range of physical setups, such as using a notebook on your lap or on a table, large sheets mounted on a wall, or a board on an easel. Each configuration engages different muscle groups. Large-format drawing relies primarily on shoulder movement, whereas smaller, more detailed work involves the wrist, forearm, and fingers. I'm convinced that deliberately training hand–eye coordination at multiple scales (finger–eye, wrist–eye, or shoulder–eye), is beneficial in learning to draw better.
It is also a good idea to experiment with a variety of media: pens, pencils, chalk, charcoal, and different surfaces such as paper, wood, or canvas. The differing tactile feedback and resistance will improve your motor control. You don't need to spend a fortune on this, but don't limit yourself to the cheapest color pencils and toilet paper.
That said, if your primary goal is accurate photo replication, it's probably easiest to start with Drawing on the Right Side of the Brain [1], along with some YouTube tutorials.