The cost is actually $20/month USD. You create the accounts as needed in WHM, not beforehand. It is not automatic.
Yes you can pay a year in advance and that is it unless you need something extra added like JSP to a domain, dedicated IP, SSL etc. which you can purchase when needed.
Yes, AccountLab Plus is excellent for helping with billing and support of your customers. I highly recommend having it installed for the one-time fee of $25. Well worth it.
Yes, we provide WHM access and master account access to Cpanel to create and manage accounts. You can create one or more packages where you set the amount of space, bandwidth, addon domains, email accounts, etc. your customers can use.
Yes, you can brand cpanel to your own logo and the reseller servers use generic nameservers. You provide support to your customers and we provide support to you.
No, you can not set one backup to run and backup everything on our reseller plans. You would have to either setup a backup cron on each client account or go to VPS or Dedicated plans instead. Running backups every night would likely cause usage issues and possible suspension if the accounts get large. We also do not allow backups to be stored on the servers. You must download them. We do backup the servers ourselves routinely and you may want to check out our premium restore service when signing up. It is still best to make it clear to customers that they should all backup themselves now and then and keep copies of their own files and databases in case of issues.