I want to sell something on ebay, but i dont know how much it was to start out with?

I want to sell an art set that has 36 colored pencil, 36 paints, 1 palette, 1 canvas, 24 sheets of watercolor paper, 1 easel, 54 pastel crayons, 2 paint brushes 1 pencil sharpener, 1 eraser, 1 scr, 1 pencil, 1 mixing and modifying color wheel, but i dont know how much it was bought for. What can i do?