Got my first leica lens, adapter question

[Avotius]

Finally got my first leica "thing" a 1953 50 3.5 elmar redscale. No oil on blades, no scratces on glass, a little dust inside, no haze or anything else, body and barrel in very much excellent condition, 90 dollars at a camera store. Not bad I think, all the signs say that its real too, so far so good.

Now then...what is the best screw to m adapter out there for me? I need one that bring up the 50mm lines. I have seen some 20 dollar jobs on ebay and some other stuff everywhere else but wondering which one is the best or best bang for buck out there.

Also is there any filters or lens hoods that can be had for this lens?