How do I set up the Miller Thunderbolt AC/DC welder for the first time?

First, unbox the unit and place it on a stable, level surface in a well-ventilated area. Connect the power cord to a suitable electrical outlet, attach the electrode cable to the positive terminal and work cable to the negative terminal, and secure the electrode holder and work clamp to their respective cables. Finally, switch the power on using the main power switch on the front panel.