Look for a successful app you can copy. Then copy it. I'm expecting downvotes for this comment, but it is the best advice I can give. You will learn tons in

Look for a successful app you can copy. Then copy it. I'm expecting downvotes for this comment, but it is the best advice I can give. You will learn tons in the process and the end app will likely be tailored in your vision. Something along the lines of this (jump to 4:43) http://www.youtube.com/watch?v=Pgy4PcSpUkI http://www.youtube.com/watch?v=Pgy4PcSpUkI