I commend all of you for your courage; yes, Africa is in dire need of comprehensive, effective health care. Unfortunately, far too many African countries are also in need of honest, dedicated leaders who are committed to improving the lot of their people, instead of just themselves and their own families and friends.
The problems you will encounter are the conditions under which you will be forced to work. The larger cities, depending on the country, have fair hospitals, but usually there is a serious shortage of medicines and supplies. The rural areas are pretty backward.
Research it very carefully before you commit yourselves, and try and get some first hand information from someone who has been there. I realize that you all have a calling which needs to be answered, but do not be fooled by any romantic dreams about Africa; it is a beautiful, fascinating continent with equally fascinating people, but it is also harsh, heartbreaking and deadly to the innocent and unwary.
I am speaking from the viewpoint of a South African, so I cannot claim first hand experience. Although we also have many of the conditions that you will encounter further north, such as AIDS and poverty, we have a well-established infrastructure and a huge network of public clinics and hospitals. However, I have come into contact with many Africans, especially those from Zimbabwe, Nigeria and Somalia, who have migrated to our country in search of a better life. Do your homework first, and try to get your info from someone in the Ghanaian health care system.