Unfortunately, I don't speak Dutch or know much about European anarchist
organizations. However, there's a Dutch anarchist collective called
EuroDusnie. The site mentions a Free Shop/Give Away Shop open on Thursday and Friday from 1400hrs till 1700hrs, and on Saturday from 1100hrs till 1700hrs. The shop can be found at Hooglandsekerkgracht 4 in Leiden. I'd say contacting EuroDusnie or going down to the Free shop in Leiden would be your best bet for finding out how to start a collective.
As for background, theory and ideas of anarchism, Inforshop is a good place to start. The site can also be viewed in German, French, Swedish, Spanish, Italian, and Portuguese.