Suggested  Items you may want to get:
Grumbacher Academy Acrylics
Paint colors:
Cad yellow medium
Alizarin Crimson
Hookers Green
Dioxazine Purple
    also the colors in your starter kit.
*Yellow Strathmore palette paper pad
*paper towels
A sea sponge
*black graphite paper & stylus
*All of your brushes
     (an assortment is nice to have: 
a good thin liner, the 2  brushes that 
came with your kit + whatever flats,  rounds, filberts, round stiff bristle brushes & angles that you have)
*canvas (I used 9x12 but 11x14 would work also.