I have done transport in this area previously with a huge company.
Unless you know Africa, it's borders, ports and how to bribe the right people, don't do it. You will loose so much money on delays,demurrage and corrupt officials that you will make no profits on 5000 ton. My advice is to employ someone who has done this before and pay them a good salary of at least 5000us a month to save you time and money.
Have fun