Mig Welder

If they didn't give you the manual for it, here's the PDF:

https://www.lincolnelectric.com/assets/ServiceNavigator-public/LINCOLN3/im725.pdf

As far as flow to start with...I have a Miller 141, and mine is typically on 20 CFH for thicker stuff and 15 for sheetmetal. You could try those settings and adjust from there.