I went on Google, and had a look at Camo's. Okay 1st off what are you painting? Panzergrenadiers...
Lets do Panzer IV, because it's a stock German Tank..
I went on google images, and entered Panzer Camo. Bingo lots of options. Using this one.
First thing to do is buy a Panzer IV, assemble it and then undercoat it. Black Primer or Auto-primer (the grey stuff) is good.
Next I paint on the Dunkelgelb (The Yellow Base colour) every Painter has his own take on this. I personally use Vallejo -Panzer Series- Middlestone (70882). I thin it with a drop of water and a drop of daler-rowney Flow Enhancer. I give the model 2 -3 coats (usually 3 light coats). Then I let it dry for 24 hours.
This picture is just to show the process and is a STuG.
The key to getting nice Camo painted with a brush is thin paint, but not too thin as it will run. I find Vallejo Glaze medium is awesome, i add a single drop and mix it in with a single drop of water to 3 drops of paint. For the brown I used
GW Calthan Brown and the green was
FOW Russian Uniform 924.
The technique is key dip your brush in the paint, then paint 1-2 lines on a paper towel this will draw out 50% of the paint off the brush. Your brush should now be loaded with paint but not overloaded and therefore the paint will not run. Then paint nice smooth lines in accordance with your pattern (e.g following the example above).
Once done, I would then varnish the model, then apply decals. Dry brush with a bone colour, and then dullcote/ Matt varnish to finish. The key is thinned paint and don't overload the brush.
If you have a specific formation/ Regiment / Division you can get some nice approximations of their colour schemes from OSPREY books. The problem being Colour Photography wasn't too common in WWII. Personally I would love to see you do a Canadian Division, those boys were mega tough, the only Formation that really scared the Germans (The Kiwi's, Aussies and Gurka's will kick up a fuss now I said that).