"I happen to know that spores from a plasic baggie will germinate and they will germinate in unsanitary conditions. Every hear of nature?"
While yes, obviously shrooms grow in "nature", it occurs due to the incredible amounts of spores released by these organisms. The chance of any spore actually finding its way to germination is incredibly low, literally a one in a million shot in nature; of course when you have billions of spores released from the existing shrooms it eventually occurs. There are far more competitive organisms that find their way into the natural fruiting media and once they've colonized it, well, forget shrooms growing. Shrooms you've bought in a bag are no doubt highly contaminated with all manner of bacteria and other fungi, most often from the genus Aspergillus. While not impossible to germinate, the chances of success are extremely low. Better off to spring for the $10 - $20 dollars for a spore syringe; believe me, they won't give you a hassle.
As for trying to grow mycelia from dried material, forget it. Unless the material is still alive, it won't grow. Furthermore, if you want to use fresh shrooms, you must cut out pieces from inside the basidiocarp under as close to sterile conditions as possible, as exposure to air makes the shroom bits a wonderful medium for bacteria and molds itself.