I released two applications for local-country use so far:
Currency rates of our national bank and news application.

Programing iOS devices is very funny.
I had very little experience of C programing and knew how memory, cpu, compilers work from university and this knowledge helped a lot.
There is a long way before I can say that I'm experienced in this field but I released more or less stable product and I'm very glad of it.

Now I'm reading Kochan's "Programing Objective-C" book. Strong familiarity with ObjC will help me improve a level of my apps.