There are numerous communities here under which name you can publish. Since some of them are already very well established it makes sense to publish content under their umbrellas, in order to be found and read. You find them when you click on "posts" on the hive frontend. I do not know it for ecency or peakd (which seem both being used in high numbers).
To create an own community without much hive power is difficult or will not be successful unless you find other people who will support you with delegations or advertisement for your community on their own blogs or community-sites.
If what you have in mind is really such a niche or not already visible topic, you might gain the interest of the crowd over time.
