What is the best way to sell software hosting service for business applications to companies?

Question by Sam: What is the best way to sell software hosting service for business applications to companies?
If I have a data center where I can set up the servers and the necessary software, what is the best way to sell the hosting service where I will manage and support the business applications for companies? Basically, I will be the outsourcing company for the applications and off-loading the work from the client companies. I plan to host business applications such as accounting

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