It took me about 2 months (every evening and all weekend) to make my maille shirt.
I was making the rings myself from bending wire coat hangers round a spindle and clipping them off with BIG bolt-cutters.
I made the majority by hanging the rings off a line of nails, set into the top of a board. you then 'knit' the lines of rings in, one ring at a time. Eventually you build up sheets of maille.
This shirt was the open-pattern. For the standard 4-in-1 European pattern, I usually put that together with the piece sat on my lap.
One thing I would have done in hindsight is buy the links. There are quite a few maille ring suppliers and not only are their rings square-section, but buying them really saves some abuse on your hands!!
Some places offer various finishes. Stainless, antique, brass, rusted, satin (my favourite) and so on. I know at least one that offers a 'blued' finish. However, the finish can (and does) wear off with use.
An option may be to heat the rings - how is up to you - and then dunk them in oil.
Oil quenching hot metal gives it a blue taint. I suppose you could do this in small pieces with a blowtorch and then link the pieces together to finish the garment.
However, I've never done oil quenching myself, so you'd best ask someone like a blacksmith for advice.