This can be simply introduced by putting flat disc's across your SSG indicating a basic off side line and putting restrictions in place that a player can not cross this line until the ball has. This should start the players decision making process and get them used to holding runs until a ball is played. As they get used to the flat disc's then introduce defenders (remove the flat disc's) as the offside line as this will be a fluid line that moves with the game but will require either players or a coach to assist to run the line. Hope this helps. Very basic but will get your players working with the offside ruling.

Thank you for this but what is an 'SSG' again?

Thank you for this but what is an 'SSG' again?

Small sided game - got it!