I'm starting to develop an app using JQuery mobile for a company.

I will have to collect some information of their web site and show them on the app. 

My problem is that they don't want the app to access directly to the website's database, and they also don't want to copy that database. So I think I will have to create a web service. 

But I didn't know anything about that, so if someone can advice me some good tutorials on how I can create such web service and how the app can communicate with it, it would be very helpful...

Sorry if my question seems to be stupid but I'm a newbie and I really want to do that by myself :)

Thanks for your understanding and have a great week end!

Titou