MIG welding is actual a wrong name for welding steel because it stands for Metal Inhert Gas. The gas used for welding steel is a mixture of the inhert gas Argon (80%) with CO2 (20%) which isn't inhert.
The name GMAW, which stands for 'Gas Metal Arc Welding', is more in accordance to the processes and it also covers all the 'arc' processes even the pure MIG welding like welding aluminium where only Argon or Helium is used.
GMAW is an easy to learn proces for beginners, although you need a lot of practice before you can call yourself an experienced user.
On the site mig-welding.co.uk there are good tutorials to be found.