im an under twelves player but I remember when i was in under 8s we did lines of 5 players you had to the ball along the line and stay onside when we got good at it we started puting on bursts of speed before we took the pass then droping back. For tackling aswell as the stuf said above we learned how to fall to ground safely by being taught the phrase nee hip shoulder head. Also do not do no contact make sure you let them play a game at the end or the or they will not enjoy themselves and quit.