Storing Flour:  

You can store any kind of flour by sealing it into bags (I use a small kitchen garbage bag), freezing at 0 F for 4 days, then storing it on a shelf or closet...it will keep at least several years this way.

Source:  http://www.endtimesreport.com/storing_flour.html

Storing Spices: 

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  Store spices in a cool, dark place. Humidity, light and heat will cause herbs and spices to lose their flavor more quickly. Although the most convenient place for your spice rack may be above your stove, moving your spices to a different location may keep them fresh longer.
   
• As a general rule, herbs and ground spices will retain their best flavors for a year. Whole spices may last for 3 to 5 years. Proper storage should result in longer freshness times. 
   
• When possible, grind whole spices in a grinder or mortar & pestle just prior to using. Toasting or Dry roasting whole spices in a dry skillet over medium heat before grinding will bring out even more flavor. 
   
• Because the refrigerator is a rather humid environment, storing herbs and spices there is not recommended. To keep larger quantities of spices fresh, store them in the freezer in tightly sealed containers.

Source:  http://www.cuisinecuisine.com/StoringSpices.htm