The ACC also manages a number of albergues, if that's your interest. No training. Here is a link to their volunteering page on the website: http://acogidacristianaenloscaminosdesantiago.org/voluntariado/At Grayland’s request, here is a direct link to the seminal post I wrote some time ago about “Volunteering in the Pilgrim Office at Santiago.” All of the information remains valid and correct to the best of my knowledge and belief.
So, go here:
See you here in future. I happen to be in Santiago, working at the office for my annual one-month stint.
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Hope this helps.