First of all,Raveen,let's sort a few things out.
You cannot control the elements.
A spell is not magic; it is a ritual attempt to obtain a magical result.
Black magic and White magic do not exist of themselves; if the intent is evil,that's Black; if the intent is for good,that's White.
Most witches do not cast spells.
Witchcraft is not Wicca; Wicca is a religion, witchcraft is a craft.
Now, I suspect that you have already been told how to start. Start with meditation,all the other basics will follow that!
Learn what magic really is! It is the changing of one or more things into something entirely different.
Lastly, Africa is not a country, it is many countries with many different cultures, and I am sure that magic/witchcraft is practiced in many of them.
Best of luck on your journey in magic.
Blessings from a very old witch!