There's a lot to consider here.
First, count the price it will cost you for the resources.
Second, count the time and money invested (domain, website setup, promotion).
Third, consider expenses of WHMCS and cPanel licensing. (or whatever you decide to use.)
Do you think you can make enough to offset these expenses?
What if you get a support request you can't handle? A chargeback?
P.S. If you're interested in hiring someone to respond to support requests, I'm your man!