Looking forward to develop a Blog Farm

I am building a Blog Farm , where front end user can create a subdomain and add a custom post . I need Website flow same as wordpress.com .

I am able to sign up , able to create multisite , but unable to create custom post and then not able to see it. I want that custom post to be public once published. What should be the Membership setting for the same.

Can you guide me the plugin which can be used with Membership for the same purpose.