I very unwisely forgot about another recommendation for starters, a much better book than the one you mentioned.

This is Churchill's "The Second World War". I'm sure you can very easily get an illustrated and abridged cheap version. It will perfectly introduce you into WWII and every paragrph you read you'll mostly enjoy, since Churchill's Nobel-like style is utterly delicious!

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"War is less costly than servitude, the choice is always between Verdun and Dachau." - Jean Dutourd, French veteran of both world wars

"A mon fils: depuis que tes yeux sont fermes les miens n’ont cessé de pleurir." - Mère française, Verdun