After the rice paper has been softened by the water, use a teaspoon and put some thai chili sauce and hoisin sauce around the center of the rice paper.I do not recommend putting in the Vietnamese Dipping sauce at this point, as the sauce is a bit runny and the rice paper wrapper may tear as it is too watery.
You can then put in whatever herbs and vegetables you prefer - I like to put in a little of everything as it enhances the taste of the Vietnamese Spring Roll.