You will be able to pay for all that on your salary, but things will be tight if you have 2 other mouths to feed!
Ideally, it would be nice for your wife to find work as well.
Transport is cheap and you can get a few taxi drivers numbers that will get you home at night. If you want to get a car, then that is up to you!
Medical insurance for you should be paid for by your company.
I'm not sure if this extends to your family as well.
Internet is relatively cheap on your phone. A fixed line can be a bit harder to get onto and a little pricey. There are a few places around the town that has free wifi however, along with the company that you work for as well
I think rent would probably cost you around 4000 pula for a reasonable place. I can't remember how much I was paying at my last place but it was around that figure but that also included power and water in the cost.
Hope this helps!