I'm unsure of if this is okay to post here, but I wasn't sure where else it could go.

What is the best way to gauge the interest in opening an RP for a particular fandom? I've considered opening a Skins RP, but I have no idea if the interest would lie in it being UK or US based, or if there would be any interest at all, and I don't want to put the effort in getting it set up, for it to fall apart though lack of interest.