You don't need a manual- most basic migs operate similarly. Take a look at the forum tutorials for adjustment clues. For spares - torch bits will be generic too, and I can recommend Weldequip, whose link you'll find at the top of the page (he's quick and his prices are as good as any)
I just got one, too. I have found manuals for similar models.
My wire jams just inside the gun and pushes out the small segment of liner that's in there.
I am about to replace the liner with "Vulcan" liner from Harbor Freight.
But I'm having trouble pulling the old liner out of the cable. It seems glued in or something.
How would I best remove the liner? If I slit the outer housing of the cable far enough, will I find some glue that I can cut?