1. Sort out necessary visas and where you will work before coming here. Consider a visa agent, they can reduce the stress significantly.
2. Leave your 'stuff' behind. Consider selling it. Once you get rid of it, you won't even miss it and bringing it with you will only make the move more stressful and expensive.
3. However, do bring some favorite books and movies and other small things that remind you of home. Books especially are hard to come by in Namibia.
4. Namibia has SPCAs to adpot from, but if you want to bring pets in, beware that the paperwork is outrageous and not cheap. It is not an easy process. Getting them out of Namibia, I believe, is even harder so if you bring them in, be sure you, and the animals, are staying.
5. Try to learn the languages! While there's a lot of them, and a lot of folks here do speak English, you can impress, befriend, and respect people by even making an attempt to learn their language. It really makes a difference.