I'm trying to make an app but i don't know where to start?

I just want to make a simple app(maybe something like an organizer for school) for fun. Obviously i need to learn some programming first but i'm not sure where… Can anyone help?

Added (1). For iphone not android

For Android you could try this program
http://www.pixate.com/
Suppose to make building apps easier.

If you have no knowledge in programming, I would check out MIT App Inventor 2 (Google it). It's super easy to use to create simple apps without much knowledge in any programming. If you want to take the long, difficult route and learn programming, most Android apps are coded using Java (you'll need Google's "Android SDK," Google it).

Note: This is for Android apps, not for iPhone

Perhaps a degree in computer science will help.

There are lots of sites in the internet teaching how to code for free. You only have to look for them.