Wow, you rarely get a 50/1.4 for that price, let alone an f/1.2, they didn't make as many of them.
Firstly, is it a 'G' lens, or does it have an aperture ring? (i'm too lazy to check, but i'd think that it has a ring, because they haven't made a f/1.2 recently).
If it's a 'G', you'll need an adapter that changes aperture for you or you're stuck open at f/1.2 (but then, you don't buy a lens like this to use at f/4), they do exist, try here
If it's a non-G (ie, it does have an aperture ring), you can use any adapter from these
AF-chips are totally optional, I've only had mixed-results with them, but I generally use them so the EXIF reads correct more than AF. I use this guy
, more expensive than the chinese ripoffs but I don't mind.
In general, I'd still rather use Live View than the viewfinder:
a) the metering is always correct, some old lenses mess up by a stop or two using the viewfinder.
b) focus is easier, even with the chip, unless you've got a better focussing screen than the default.