Do I need a travel guide?

For travelling its good to have a travel guide. In this way you get a lot of information about the country and the people living there. Also you can find cheap guesthouses, hotels and buses.

For germany there is only one travel guide:

"Ghana - praktisches Reisehandbuch für die Goldküste Westafrikas Jojo Cobbinah" Peter Meyer Verlag  (sehr zu empfehlen wenn man nicht immer alles übersetzen will ;)

But there are more english ones which are also really good and give you a lot of information.