Yes, you do, it is mandatory to have both Insurance and Vaccination to participate in our program. Please make sure that you have an insurance for your whole stay in Ghana which also takes you back to your home country in case of continued sickness.
Also, you need vaccinations. The most important is yellow fever. You have to show your Vaccination Card at the Kotoka International Airport in Accra.
Other useful vaccinations are Hepatitis A/B, Tetanus/Diphtheria/Polio, Typhus, Rabies. These are regards of the Ministry of Foreign Affairs of Germany. Please have a look at the website of your home country for more information. Also, you should talk to a tropical doctor, who is responsible for giving you the vaccination against yellow fever and others.