Welcome! Huerro covered the basics pretty well. Building a bike is not too terribly hard. I also came from a background of working on cars, and bikes are even easier to work on than cars.
My biggest caution involves the cost: building a bike from scratch can add up. My first build was my Cannondale singlespeed, and I started with the frame. By the time I was done, I was over $500. It's a great bike to ride, but it was way over my initial budget. If you start with a complete donor bike you can do it a lot more cheaply.
Do some reading and research and you'll find a lot of good info! The people here in C&V tend to be very helpful and friendly, too.