welcome to the forums, Bismark9.
are you going to build German or British?
was not sure as you mention AK, but the 25 pounder is a British gun.
i use Tamiya acrylics, but sometimes you have to diddle the colors a bit.
many of the gang use Model Master (both acrylics & enamels)
i just finished a Quad & 25 pounder. used a lot of Tamiya's "desert yellow"
(XF-59, i think).
some of the gang can give you a better idea abt what German vehicles served in the AK.
i think they would be grey or dark yellow (dunkelgelb) depending on the time period.
this page does give some good general info for German colors
http://www.achtungpanzer.com/camo.htm
this page has a few paragraphs mentioning which panzer divisions served in Africa
http://www.achtungpanzer.com/pzdiv2.htm
from there, you might be able to search other sites to see what vehicles were attached to these units.
this page will lead you to more Desert Campaign info:
http://www.topedge.com/panels/ww2/na/index.html
this site has a lot of British Army info
http://www.warlinks.com/
i am sure you can find plenty of info on the 8th in Africa.
use the 'site map' link to navigate.
and another good site for German info:
http://www.angelfire.com/ok/panzerkampfwagon/index.html
and includes this vehicle list:
http://www.angelfire.com/ok/panzerkampfwagon/armor.html
another good one:
http://www.geocities.com/kkh_khan/AfrikaTanks.html
now - to give credit where it is due:
the links above were all found on this link page:
http://www.achtungpanzer.com/ww2lk.htm
good luck & welcome aboard!