i always went on forums like these asking for sigs until a friend of mine showed me how so i thought it was more productive then sitting on facebook and voila
mmmm, I got into GFX because of a friend of mine. He showed me the kinds of things he could do with Photoshop and how he could manipulate photos and renders and turn them in amazing pieces of work.
I eventually wanted to learn from him and he has kindly taught me everything he knows and still does so to this day! I'm still in the basics but I'm slowly but surely starting to work my way up and I hope to be able to get really good with Photoshop in the future =D!
I am a major wrestling fan. I went onto a wrestling forum and saw all these people with cool flashy signatures...... and that inspired me to do graphics
Above links are very nice but I would suggest you one thing, be sure to read carefully all the terms of the program before you make any commitments to make sure you understand what you are joining. Hope my suggestion will help you something.
Best of luck!