Hey there,
1. The 5 free sites come with Creative Cloud, these a the very basic forms of BC. Each has 1GB of space.
2. If you want to upgrade or purchase a BC site here are the monthly costs - US Yearly Pricing | Adobe Business Catalyst Please note that what the free sites you have are less featured then any listed in that link.
3. You do not get any email accounts with the 5 free sites.