If not too many people want to post at the start, it can always just be a volunteer or two from the initial pool of interested people.
Perhaps, at the very beginning, the submitter could just take care of all the administration (hopefully it's not too much work) and everybody could work out a system for discussing and approving posts as a group.
By the way the "big thing" isn't the hardest part of this. The most important thing is probably the review of issue/pull request, and everybody who want to help can do that ;)
Perhaps, at the very beginning, the submitter could just take care of all the administration (hopefully it's not too much work) and everybody could work out a system for discussing and approving posts as a group.