When I worship the orisha Our lady of Charity what spell should I include for fertility also what offerings?

Question

should be placed before her altar?

Answer 1

Do you mean Oshun? In Santeria, Oshun is sometimes identified with Our Lady Of Charity. Her color is yellow, and her metals are copper and gold. She favors peacock feathers and mirrors.

http://www.pantheon.org/articles/o/ochun.html
http://en.wikipedia.org/wiki/Och%C3%BAn
http://www.lunaea.com/goddess/creativity/oshun.html

Answer 2

You must always offer a sackful of fermenting bat droppings and 8 sticks of celery, otherwise your God thing will be upset. Singing " Old Macdonald had a farm" works as a spell.