Purchase a WHMCS License through WhoGoHost.
WHMCS(WHM CompleteSolution) is one of the top billing, client management and support solutions. WHMCS helps with the management of web hosting, domain management, companies with recurring costs and membership, Software Licensing. It can also be used by Web Designers and Developers.
The best part of using WHMCS for management as a reseller is that it eases a lot of stress by automating a lot of processes, such as recurring invoices, ticketing, announcements, knowledgebase amongst others.