dadada72,
Your case number is high. Mine was high too (AF73xxx). The numbers for africa creep up slowly and in then, all of a sudden, in the last month (September 2011, in your case) all the number become current. You will have to watch the visa bulletin, as they suggested, but I can guarantee your number will only be current in September 2011. There is absolutely nothing you can do untill then, except to get all your civil documents in order and to learn more about the application process on websites like these. At least you have enough time to get your documents and you are under no pressure to get them quickly.
I must also point out that it has happened that not all the number for Africa become current in the last month of the DV cycle (in which case you might not get a visa), but this rarely happens.