Run a paid blogging network in this format: blogs.mysite.com/blogname/

**Paid Blogging Network Model I Want To Implement**

1) I want my actual mainsite to be http://www.mainsite.com

2) I want it so that there are no free registrations on the site, people can only register on the site using one of the paid ProSite memberships, and upon registration they get a blog at blogs.mainsite.com/theirblog

**I want to implement this Model on two different websites:**

==A) I have a single-site website with thousands of pre-existing members==

- On this site I want to convert to multisite model where my existing website continues being at http://www.mainsite.com (without a /blog/ slug)

- Pre-existing users are switched to a free plan that doesn't include a blog, and this plan is not visible/accessible to new members

- I want it so that there are no free registrations on the site, people can only register on the site using one of the paid ProSite memberships, and upon registration they get a blog at blogs.mainsite.com/theirblog

==B) I want to implement the model on a new installation with no pre-existing content/users etc... so...==

- I want my actual mainsite to be http://www.mainsite.com

- I want it so that there are no free registrations on the site, people can only register on the site using one of the paid ProSite memberships, and upon registration they get a blog at blogs.mainsite.com/theirblog