Pro Sites + Membership... Pay on Sign up?

Trying to set up a premium multisite network, much like edublogs. I have installed WP Multisite, Pro Sites plugin, and Membership plugin. My goals are:

1. To have 2 pricing plans: Silver ($10/month) and Gold ($20/month). No free plan.
2. Offer a 14 day free trial on both plans.
3. Require credit card info at sign up (day 1), but don't charge credit card until day 15 (after the 14-day free trial).
4. Account creation & site creation (I'm using subdomains for my multisite network) should be an easy, intuitive process. User signs up, they're emailed login info for username.networkname.com.

Step by step instructions for setting all of this up?

What's possible? What's not?