In reply to Oceanrower:
Stick is OK for heavier work and the odd bodge. With a few exceptions like cast iron work it's a poor choice.
Basic MIG kit is pretty versatile on steel, it's good put of position under cars and quite controllable with practice. 150a is plenty, for thicker sections you can take two passes. Can with care be used on very thin sheet.
Tig is vert versatile and great for bench work or where access is reasonable. DC is cheap and will also do stainless. AC is pricey but a must for aluminium. I have a single phase 200a set that's never used at full power, 120 to 150a is plenty and the torch doesn't overheat at that.
Gas for MIG and tig isn't cheap. For occasional use little bottles work but for a bigger project rent one. Co2 is cheaper than argon so use that if all you weld is steel.
Get a decent aito darkening mask. Don't weld galvanised steel, it's toxic.
Jk