a- No personal experience with this machine but a look at millers site indicates it is a DC constant current machine. At least stick weld steel (and other materials with appropriate rods) probably more.
c- Ask the seller to demonstrate the machine, you should see it weld at a low setting and at a high setting.
b- No big leaks, no big smoke, be a little flexible, it's only $200. It should start without too much trouble (needs starting fluid is a bad sign). No mechanical rap when running. The demonstration welds should look nice, but that may just indicate how bad or good a welder the seller is. At the low setting the arc should start easily. At the high setting the engine should be able to carry the load without losing a lot of rpm's.
Lots of different people come here, newbe, artist, hobbyist, and pros too. You will find that you are welcome here.
Bill
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Like Bill stated, "Welcome", if you find you need to ask more questions after you've had a chance to ckeck out that welder, come on back.
Many, many different levels of expertice and many different backgrounds in the welding field here, most of us fit in somewhere. :)
John Wright