Programmer's input welcomed

I'm a graphic designer working with a programmer on a iPhone game that we hope to release within the next few months. However, I would also like to dip my toes into the coding aspect of the process.

I'm at the very beginning of "Objective-C Programming" by The Big Nerd Ranch. Has anyone read through this book? If so, is it a good start and what should I be looking to next? I have no background in any language and this book so far hasn't been baffling. Thanks for any input here or on twitter (@mpyr99)

Just used a float variables to calculate poop time. This makes me proud, if you feel otherwise; go to hell.

Thanks again for any help.

-e