Our user guide is a good starting point for becoming familiar with Dato Predictive Services. Here is an end-to-end walk-through: https://dato.com/learn/userguide/deployment/pred-getting-started.html
The requirement to run a predictive service is a machine to host it. The easiest option is to use Amazon EC2. You just need an AWS account to be able to create a predictive service (using the GraphLab Create API), then add your model there. There are a few options in AWS that you don't have to pay for, at least initially. Another option is to install a predictive service on a local machine; that is a feature we just released, and it is a little more involved for now.
Give it a try and let us know how we can help further!