Jeanie, why not just go to the tour agencies and see what they have to offer, they do offer Kenya and South Africa trips. As a starter for Africa, i recently joined a local tour here and went for a 10 days trip. Get to see the history, the coast lines and did simple safari, etc.
I would say unless you are an animal lover, if not 10-12 days of safari might be a little too much. Also visiting Africa does have some risk like diseases, theft and robbery. It is advisable to travel in a group especial for gals. Plan carefully.