i'm seen several tutorials and both are big and confused. so i'm asking here so try understand it from scratch.

Part 1: we have the player with a PosX, PosY and a direction(the angle direction)... the cam size is 320X200(like Wolfstien3D).. from the player i must 'draw' 320 ray's... my problem is what angle(because i must angle them for get the 320 pixels) i use for start the ray one by one... how i start the ray's?