Obviously it depends on the amount of records you press but you should allow something like £200-£500 on mastering depending where you get it done and around £1 per copy for pressing+sleeves and stuff (this is a VERY rough guide by the way)dont forget artwork costs,promo mailout and of course artist/remix fee's if there is any involved

also worth remembering if it does all go tits up and you dont sell anything you are liable for all costs.