Hi GM,
Here is a good link ( Axis Forum) to start you off with with plenty of information from learned folk who have an interest in North Africa during WW2.
Armour and supporting arms changes from early war to the later period in North Africa.
http://forum.axishistory.com/viewforum.php?f=56&sid=b28b859e077185afc02c2c5d9b3d25e6Now for vehicles and figures. As Paul has indicated, Crouchie from Chieftain Models, BAM, Artizan, Brigade Games, Company B, AGN, Black Tree, Battle Honours, WestWind and Chiltern - just to name a few! All have something that can be used in North Africa.
Don't forget the Italians too, they were excellent and brave soldiers. BAM and Artizan have some lovely Italians in their range with more to come and supported by some very good vehicle models from a number of companies.
Same goes for the French forces too, whether Vichy or Free French.
Hope this helps.