I am new to soap making but successfully make a pumpkin soap from a recipe. My question is, how do you figure a recipe by yourself? where do you start? How much oils do you use and how many different ones can you use. also, want to whiten some of the soap so I know that takes the titanium dioxide to mix with the oil. How do you know how much it takes to whiten a certain amount? looking for a Christmas recipe using cranberry and I want a white base with red and green swirls on the top. thanks