I've got an idea of an app but I know nothing about development, what it costs, how long it takes etc. Anyone here an expert?

You may want to start here:

iPhone Dev Center (http://developer.apple.com/iphone/)

Download the developer tools (free) and there's a whole pile of how-to videos. From my understanding, the only cost to you will be the $99 fee to submit the App to the App Store for review...

M

Yeah I downloaded that but I know nothing about programming so I'd rather just pay someone instead.