Here's a great tutorial you should check out any time you want info on getting started in mobile games:
^ Dunno why my comment's getting so many downvotes. This is yet another of the endless posts on gamedev every single day asking the same question that has been asked here. It's not even a good question.
"But I wanna know what the guys on gamedev think!" Well here, I looked it up on gamedev for you.
http://www.gamedev.net/index.php?s=91066940eef8fce03e6859dbf8065824&app=googlecse#gsc.tab=0&gsc.q='where to start mobile games'
Seriously, to everyone reading this, the next time you want to know where to start with anything, be it programming, cooking or mud wrestling, just look it up.