There is unfortunately about 40 ways to do this and each ones depends entirely on your skillset … so not one particular tutorial is going to help you.
What you can do is look at the marketplace, there are some packages there that have done the basics for you already. You can either re-use those or tear them apart to see how they were done.
I personally am using a secure web-service that consumes and produces JSON and is hooked up to my Database via Hibernate and an Entity Framework.