While magic can aid your attempts to land a job or money, it cannot or should be the only thing you are relying on to get money. Go out and look, be vigilant for the job you wish, and look for a simple spell that can bring you prosperity.
As for secret cults or as we call them in America, covens, that is not needed at all. One can practice perfectly fine magic on their own.
Another thing, is depending on the surrounding culture in Nigeria, be careful. There are many who would harm you for using magic or practicing witchcraft in some places of the world. If you are in a culture hostile to the use of witchcraft, disguise your spells as something else and keep them hidden.
Best of luck.