For example, add 2 tablespoons of cinnamon to a half cup of sugar. From there you can alter the ratio depending on your preferences, and then store it in an airtight container.
You can use white, brown or turbinado sugar, but the latter two may have limited uses based on their flavors and textures. You can also add a bit of salt to enhance the flavors.
You can use any cinnamon from mildly sweet Ceylon cinnamon, or "true cinnamon," to strong, spicy Saigon or slightly bitter Cassia cinnamon, which is most readily available.