Artizan Designs has a page with very good painting guides for a wide variety of World War II Uniforms.
This is a pretty neat little YouTube video of two guys and a WWII game. You’ll love the stop action animation.
Running a “campaign” can add context and interest to a miniature wargame. Here’s a Tobruk Desert Campaign for Flames of War.
The folk at the Flames of War offer “Open Fire,” a set of quickstart rules for 15mm WWII gaming.