Starting reseller hosting with Google cloud and centos webpanel,

I'm planning to start reseller hosting service with Google/aws cloud and centos webpanel. I'm starting with a very low budget so I cannot use cpanel.

What are your suggestion on this, is there any more cheaper option than this?

If you are low on budget then what you are waiting for? 

Go with CWP which is the best and advanced control panel among all free control panels.

Be aware before using google cloud that no out going mail using your own smtp is allowed from google cloud.  I learnt that the hard way.