You will need

2-3 years - 6 Balls
4-5 years - 7 Balls
6-7 years - 9 Balls
8-9 yeas - 10 Balls
10-11 years - 11 Balls
12 -13 years - 12 Balls

3.25mm and 4mm Needles
Cable Needle
4 (4 : 5 : 5 : 5 :5) Buttons