ahh...DAK, my favorite...my forte, if you will. I don't really know your level of skill (I'm not trying to insult you at all but that remark), but I would recommend something basic, like Panzer Colors is always interesting. I have only had to use Pz Colors I and II. Some other ones are good too, like Concord books or Osprey books on specific tanks, like the III or IV, but it depends really on what you're actually modeling. They are always a help because in reality, there was basically just variations of tan (yellow-brown or dark yellow, maybe sand yellow) but nothing like an orange tan... I hate people who paint like that....there are also some dark gray vehicles as many were of course early war types and weren't even painted and some that weren't actually had a type of mud put on them that served as a sort of camo. You can do some red-brown ones, possibly, for real late vehicles. Some other ones were like a pea green, like III Ns that supported Tigers in africa.
Weathering depends on what you want to do. I always just use varying colors of oil that would be like brown and tan mixed together and thined with spirits. The thickness of it all depends on you, but if you make it real thin, it can of course be a while to simulate effects. It just depends on you and what you want the vehicle to look like. Some were really in just bad looking shape because of sand storms or whatever else, and others were just like dusty and looked kinda like they were brand new. So again, it all depends on you. If you have any comments or something else that you would like to say or know, just ask and I'll try to check back with ya.
RC