Hey man, I know where you're coming from. My love photography started with my love to photograph cars. First start shooting them as much as you can.
Of course, dont just go shooting for no reason. Read up on lighting and so on first. I strongly believe that it is probably the most important thing you can learn - lights and how they affect your pictures.
I have not taken any classes before, but I just kept shooting. I started with a crappy still shot feature on a camcorder my parents bought for the family, moved on to a point and shoot, then an old school film slr (which got expensive, really fast), and I finally now invested in a full on dSLR.
Don't worry if you don't think your equipment is good enough. First get down the basics; lighting, technique, etc... Then you can worry about it looking professional. You will eventually get there, just put your heart into it, and don't give up until you're satisfied.