How to make money creating and publishing iPhone apps?

Okay, so I live in a remote location well my nearest neighbour is close to 50kms away (farm). My parents have been wanting me to get more self efficient so I decided I would surprise them by buying a car. I'm 16 and have distant education. Due to my location rules out a lot of jobs which I could do.

I'm able to creat website and iPhone apps. So where can I earn some quick money 1000-500 dollars a month creating mobile apps for businesses. I can creat apps I just have no ideas! Please help.
Thank you.
If you have an idea let me know and we could split profit.
I have made many apps for made up businesses to test and can do it, I just need a business who would pay me.

I don't know much about this, but I believe the app publisher (if you arent self publishing) makes a profit off the app, apple makes a profit, and the developer does too. If the app is free without in app purchases then when someone clicks an ad, money goes to apple, the publisher, and the developer, if the game costs money or has in app purchases when it/in game stuff are bought, the devs, publishers, and apple get money. If it is an app for the company that you made the app for to sell stuff, then maybe every online purchase would give you money.