New bento-boxer here! What do i need to get for my stock cupboard to get me started?

Hi all, Ive ordered myself a bento box and am determined to start making bento-lunches in the new year. I love this site and all of the recipes and ideas, so i need a 'shopping list' to get myself started. What would you suggest? I have sushi rice, nori and rice wine vinegar, but thats pretty much it so far!!