couple of 1210's and a reasonable mixer will set you back a grand if new, maybe £600 second hand.
don't worry about amps and speakers too much, you can usually plug into a system in a bar/club etc.
good headhones are a must though, sehnisers are between £90 and £150, these are fantastic, or were when i bought my gear around ten years ago.

if you go cd mixing it can be much cheaper, although the retun is usually less than a vinyl mixer, although music is easier to source over the net instead of hours in record shops trying new material.