Extracting Data From WordPress

Hello,
I have a wordpress that I would like to convert in a app to distribute in an Apple store. My question is if anyone noes how can I extract my Data From WordPress Database and Convert it Into an unpaid/iPhone app.
I now i ned a php conection to the server and all of that, but i’m a newie, and loocking for any Tutorial, step by step, or any information or a book where to find such information, so that i could learn ?
Thank you very much