I am an experimental artist - constantly learning new things so I can create the things I dream up. For several years now, I have wanted to learn to weld, so I can build yard-art out of rebar and scrap metal. Now that I'm in the position to actually learn how to do it, I start researching what tools I'll need. This led me to wondering what it is I need to learn: Braising (proper spelling?), where I can combine different metals, or MIG or TIG welding?

My structures will be art, not loadbearing or functional. Which would be the best method for me? Which method is simpler? Cheaper? What tools do I need for each, bearing in mind why I want to work with? If I was to get everything I need for Christmas, what can I expect to spend for a basic starter set? HELP!