Multisite with monthly subscriptions

I have configured a multisite installation. I have a domain name that specifically targets a certain niche. I’ve been contacted many times over the last 16 years by people who wanted just an email address on this domain. Offering an actual site on this domain name is going to be very popular.

So my brain is all wrapped up in creating a business model for this idea. In general, here is what I am wanting to do:

Users will have to register and provide payment in order to have a site.

Maybe there is a way to create their site as a trial but not make it publicly viewable. Otherwise they will be required to provide credit card information in order to create their account/site.

It would be subscription-based. Monthly, 6 month, 1 year rates. Also, there will be a basic subscription and a premium subscription.

Once their site is created I want to provide them with the plugins, templates and widgets that would allow them ecommerce on their site to sell items. Not just any item, but a specific kind of item. They will have to enter their own Paypal account info, etc.

The user will be able to upload images of their item(s). They will also be able to fill out information in their profile that will be displayed on their home page.

Ok, the business model is somewhat vague, but you can probably see where I’m going with this?

Here are my questions:

Does anyone know of a model that’s been setup already to sell a site/account in a multisite installation?

Do you know of a good plugin that can handle subscriptions, automatically charge credit cards on due dates, send invoices/receipts/notices on a scheduled basis, and that can deactivate an account due to lack of payment?

Basically, I’m looking for a good subscription plugin that I can tie in with purchasing a site.

Any links? How tos?

Thank you! I’ve done quite a bit of searching and don’t see what I’m needing. Am just wondering if I have to start from scratch on the subscription plugin.