Actually, I think that is a two step process. Look at the other local communities to get an idea for what kind of information is useful to share: http://www.linuxmint.com/communities.php
(aside from things like links, perhaps also a banner or logo and who will be the community leader for contact by the Linux Mint team).
Aside from that information, if the local community with be using the Linux Mint name (like domain name or website name) and branding (like logo) please first get in contact with the Linux Mint project lead Clement Lefebvre at firstname.lastname@example.org
to get permission to use the Linux Mint name and branding. For local communities I think this is but a formality, but Linux Mint is copyrighted and trademarked so permission is needed.
In the same email you could include the information for your local community. If you do that in the same ordering and in the same style as one of the other local communities, Clem can just copy & paste it. Or you if you're not ready yet, you can ask me later here (assuming you already got permission from Clem) and I'll ensure it gets added to the website.
Congratulations on moving towards a local community!