Demand curve Economics, business and finance homework help

HiAssume soccer cub season demand curve  q-50000 - 50P.a> What quantity of season tickets is demanded when season tickets are free(p=0)?b> At what price do season tickets cease to be bought (Q=0)c> use information from a+b to sketch demand curve for the club.d>what amount of season tickets is demanded at £600 and £700? what revenue is generated from season?