Here is some info on New Orleans Voodoo.
Voodoo rituals are very amazing. There is dancing, chanting, and offerings are given. In the center is of all the dancing or chanting is an altar with dolls and objects and offerings that the Loa you?re trying to ask for help are associated with. Rituals are sometimes done on the day of the Loa, or on the number of the day of the month.
An example of this would be if you were going to do a ritual for Papa Legba. His day is Monday, favorite number is three, and his colors are red and black. His favorite offerings are candy, cigars, corn, and tobacco. On the altar you could make a doll dressed in red and black. You can give him a offering of one of his favorites. You could also put three of something, like stones, on the altar. Papa Legba is the first and last to be invoked in a ritual because without him there would be no communication between you and the other Loas.
Also, each Loa has their own Veve or vever. The veve is a symbol that, like a Voodoo doll, my guess, represents the Loa in the ritual. They are usually drawn on the floor with cornmeal or other powders. My guess is that you place your altar, offerings, and sacrifices, if you do that, there. Due to some disputes, there are sometimes multiple Veves to one Loa. There is a picture of one of the Veves of Papa Legba in my photos.
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