Well, you can also have a look at other similar threads on WK to see how others are setting things up. It’s convenient to have a template:
Based on what you mentioned, you could go for something like this one: 魔法少女育成計画
Or do your own thing obviously, but 'ts a nice thread you got there, would be a shame if something happened to it again, copying templates is the easiest way to set things up.
In particular, you could already set up a poll for participation, and maybe another for starting date. It gives you relevant informations in a more compact way than having to read through a bunch of posts.