If you can't take a class, pick up a copy of "Welder's Handbook", a complete guide to mig, tig, arc, & oxyacetylene welding, by Richard Finch, 1997. It's stocked at your local Ba-Lowes or Home Despot in the welding supplies area of the tool dept. Don't be tempted to buy anything while you are there. Get the book (under $20), get out, go home and read the thing. Check out local shops, what your buddies have, and try a few units. You will often come across guys wanting to upgrade and you might score a nice unit. Ask questions. The book is worth having as it is a general bible of welding info. The guy who wrote it learned to weld as a kid in a shop, now owns an aerospace welding shop, and has been a chief engineer on welding the gantry tower for the NASA space shuttle. He give tips, welding exercises, pro, cons, and a pretty level assessment without b.s. or brand name butt kissing. Everyone ought to have a copy as he discusses theory, and has temp charts, setup charts, exotic alloy charts, gas flow recommendations, etc. I have given this book at least 3 times as a Christmas present in years past. Check it out. It makes great bathroom reading if nothing else. No affiliation, yada, yada, etc. etc...