This question is for a Multisite with Pro Sites to act like Wordpress.com:
Is it possible to make the "Signup" process my basic "Free" package the only choice. This would make it so a user can quickly sign up and get the basic features. After sign up they will have the ability to upgrade to our Premium/Pro versions that have added features like Domain Mapping and analytics.
So the process would be:
User clicks "Join Now"
User signs up for Free with basic package as the only option.
User's site is created via Pro Sites/Multisite
After registration user has the ability to upgrade to our Pro or Premium version that eliminates ads and adds features like domain mapping.