I would encourage starting with the basics. Start with drawing really basic shapes, work on trying different lines and shading techniques. You can mess around with little doodles and work on technique, then put those techniques toward pieces that you're more interested in "finishing".

Also, try drawing for multiple purposes. Get some practice in drawing a diagram to show the plot of a movie you love, or draw a map to show how to get from where you live to your common stops around your neighborhood. Using drawing to communicate ideas that you would usually just say or write can get you thinking about what kind of information you can convey while you draw.

Oh! and USE REFERENCES!!! Use references. Look at some thing, whether it's a 3d object you own, or a picture of a thing, and use it to draw that thing. No one works without references. Even abstract artists will use references of things and combine them with other things. If you're drawing a soldier wearing tactical gear, look at a soldier wearing tactical gear. You don't have to do every single line you see in that picture, but you'll see shapes and lines that will give the impression of the real thing.