Welcome to Strobist.
If you are a complete beginner at lighting, you are in the right place. Strobist's Free Lighting 101 course starts from absolute zero, and is widely considered to be the best resource of its kind on the web. Over 4,000,000 photographers from all around the world have taken the plunge before you. Come on in, the water's fine.
You probably already have most of what you need to start creating kickass photos with your own small flash, and all of the information on this site is free. If you want to grow into more powerful lighting equipment later, fine. We talk about the big lights, too. But your small flashes are the perfect starting point -- small, simple and cheap.
Already familiar with small-flash lighting gear and techniques? We also have an On Assignment series, where you'll be guided through dozens of real-world assignments, showing exactly how they were lit.
And since lighting is not a destination but rather a journey, bookmark Strobist's front page for the occasional new dose of lighting-related learning and fun.
Got questions? No problem.
Join the over 100,000 people in the Strobist group on Flickr and fire away. But please, search the relevant terms in your question as it has probably been asked and answered before. And no worries, everyone was a newb at one point.
You can post your successes there to show off, or your failures when you need help. It's a very social place of peer-to-peer learning, filled with enthusiastic people from all over the planet. There's probably even a Strobist meetup happening in your area, where you can meet other people just like you who are learning to light.
Okay then, pick a place to jump in:
Lighting 101 (Most people start here)