Simple mastermind game in delphi!

Hi guys and girls,

im trying to suss out how to make a simple mastermind game in delphi, no interface is required, its a simple version, using numbers 0-9 instead of colours. I am trying to get started and dont no what to do. Ive worked out i need to use procedures, records and at some point parameter passing but i have no clue what procedures are?

I looked it up, and dont think i really grasped it that well, but heres what i sorter drew up:

procedure assignvalues
var Num1, Num2, Num3, Num4: integer(0..9);

what do i need to do for this little section to work! do i need to add in what the random four digit code is? i.e
Randomize;
Code := Random(10000);

Someone help please!!!