So far, my summary:
Thanks to all, this has been really helpful / educational.
Machine / Equipment:
Still targeting the Hobart 210 MVP. The Miller 211 appears to have dial type settings instead of fixed and *perhaps* therefore, offers more simple setup / controls
However, I am not certain that (for me), I can justify spending that much.
Polarity:
I understand the "very basics" of polarity. On my Thunder Bolt XL stick, I have a large toggle switch to change, although I hardly ever used this, leaving it on DCEP (DC+). I tried AC a couple times on rusty metal..
How this is changed on a MIG machine.... I do not notice a front panel switch. So I suppose this is a simple process.
Still have questions on:
1.) Have never used a MIG, but assume that using flux core wire would be similar to welding with rods (stick)
2.) IF I chose to use shielding gas,
* I assume I would use a standard 75/25 CO2/Argon
* Today, I would have no idea where to purchase a "refillable" bottle. I have an "Airgas company" store locally - maybe there ? I have heard stories of people buying torch bottles that cannot be refilled / or bottles that some suppliers would not refill.
< Philosophical mode on here>
Perhaps I over think things ? I am just trying to understand better before I make any decisions. If my refrigerator goes south, that is something that needs replacement right away - quick investigation - stick to a reputable brand / store - go buy. The welder.... I can take a little more time to decide on. I think the purpose of these forums is to get opinions from people who know a heck of a lot more that I do ! Which, is probably everyone.
< Mode off>
Again, thanks to all who take the time to help here !
J.