Its depend upon what services you are going to offer customers . If you provide only shared hosting, your will earn limited. But if you offer shared hosting , reseller hosting , vps hosting , email hosting, ssd server hosting , wordpress hosting, manage wordpress hosting, website development , sms marketing >> each product will give you some profit and small things will make things bigger.
Sky is the limit when you are ready to take effort. Money is everywhere . Its on you how to picked up that !