Earthworms

I am considering introducing earthworms into my coastal garden for all the obvious reasons. After searching the net I still have a few questions. Can anyone help? 
 
>> What type of earthworm is best i.e reproduces quickly and is suitable to the conditions described below ? 
>> Details of a supplier of this specific type?
>> Will an increase in earthworms attract moles to the garden? 
>> The 'soil' in my garden is acid and sandy (fast draining) with few nutrients and, although mulched,  is exposed to hot, salty wind and high temperatures. What effect will this have on the reproduction, and eventual size, of the earthworm population? 
   
Any other general info would be appreciated.  
 
Charl de Winnaar
Cape Town
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