Pinjas:
I do a lot of Tig welding. I do race cars, airplanes, Tool steel and lots of walk in projects. Take Freelance Fabber's advise. Check out the Miller Diversion. I used one at three different Miller demonstrations. I have the Miller dynstay 300 and the dynasty 200 that I used almost every day. The Diversion was built for persons like you. It is the only way to go for a beginner Tig Welder. Check with Miller to see if there are going to be any demonstrations of the Diverson in your area and go use one. The people there will guide you through it. Two other things with tig welding, if you need reading glasses be sure to get a pair of reading glasses to weld with and second get a good light weight welding helmut with an auto-darkening lens. Spend good money on a helmut, look a the Miller selection. As you can tell I am a Miller fan. I have tried others but always came back to Miller. I have Miller Tig, Mig and Plasma cutters. Check the Tig welding prices on Ebay. I think you will find that you can get one delivered to your door for around $1,350.00. This is where I have found best prices.
Once you have accomplised the Tig you'll be able to do steel, stainless, aluminum, brass, bronze, titainium and combinations. When you have a question or advise on welding you can call the toll free tech line for Miller
Good luck and remember, Practice, Practice and etc.