Hello...
Thanks to its size, this model is universal for using standard 6,5 cm toothpicks as well as 8 cm variants. The tray should hold a standard pack of toothpicks.
As the axis of rotation is inside the model, it was necessary to split the model into two parts and gluing is required. I recommend to fold the model and align it carefully. Then put temporary tape on the back of the model to fix this position. Apply instant glue to the areas to be glued together, snap the model together, fine tune the alignment and press the two parts together until they are sufficiently firm. I also recommend rotating the axis to prevent any excess glue from sticking.