Pseudo code... (not real code but help)
Dim Board(8,8) =(X,Y) positions.
That's your board.
Board(1,1) = 0 could be bottom left = No piece
Board(1,1) = 1 could be bottom left = black piece
Board(1,1) = 2 could be bottom left = White piece
Board(1,1) = 3 could be bottom left = black Crown
Board(1,1) = 4 could be bottom left = White Crown
You can have 1,1 top left if you like it's up to you.
You move the pieces around, and put numbers in the Board() that match where you moved the piece to. Obviously the game starts with two rows already filled. When a piece moves you have to change its old space to '0', and put a number in its new position. Checking that nothing is there, and checking if a jump is required.
From this information you should be able to get the first part of the game working.