I don't know if a place exists but I think its time experienced individuals, groups compile a best practices list to help future markets. Most of these new markets popping seem like the best they've ever done was create a wordpress site with a plugin and hide it behind tor.
Edit: I know that general info exists, the information regarding a hidden service is hard to find, its in bits in pieces, my biggest fear is that inexperienced dev's try and pick from security, speed to market, and keeping it hidden. There doesnt seem to be a combination of this info available for the general community to help us advance.
You want countries without extradition treaties with the US:
http://www.wsfa.com/story/22665099/countries-with-no-extradition-treaty-with-us