Hi - Maybe my below precise reply would help you.
1) Malawi is right hand side driving country.
2) Speed limits in major towns within 50KPH.
3) Road conditions are good, I would say better. (as compare to other African countries)
4) Not many difficulties while driving as far as you have enough documents and accessories in your vehicle. (I.e driving license, fire extinguisher, triangle, reflector, spare wheel)
5) Malawi is still not that populated, but we can consider office hours as peak hours as far as concern of traffic load.
Kindly ask specifically if my above replies would not aid you. (As i am not sure the cities you are going to visit, your country of origin, if you are travelling to Malawi by road or air, your length of stay etc)
Thank You!