Every beta site, when it becomes public, decides on who it's moderators should be. This is done with input from the Stackexchange team.
Individuals can nominate themselves or others to be moderators. Third-party nominations must be accepted by the nominee to be valid.
As Tim Post has said, moderators need three qualifications:
- Consistently patient and fair when dealing with other users
- Have a little time each week to devote to moderating the site
- Willing to help jump start promotional activities, and guide new users as they find the site for the first time
It should be helpful to review Stack Exchange's theory of moderation.
Good luck! Final decisions are made by SE. Edit: I forgot to add this from Tim Post:
Nominate below with whatever text you'd like to offer about yourself and why you want the job, and include a link to your profile on the main site. Do you feel strongly that someone else would be a great moderator? Feel free to nominate them as well, explaining why you feel strongly about them as a potential candidate, and link to their main profile as well.
Third-party nominations need to be accepted by the person you nominate, they can either leave a comment to accept, or edit your post with whatever detail they wish to add.
Edit: There is more information on the moderator nomination process during the beta phase at Moderator Pro Tempore, including a longer list of qualities for who would make a good moderator. The linked page also specifies that the following text should be posted in any moderator nomination thread:
Self nominations are okay, and even encouraged. Most sites have not had sufficient time for many users to stand out. Self nomination is simply a way to say, “I’m interested. Let my record speak for itself.”