Sio2 related help needed

i need some guide lines regarding desiging a game in sio2 hope some one can answer my questions
i want to develop a car racing game in sio2 for iphone where two cars race against each other. and need to know how to simulate differnet tracks and cars on them and change their speed . is there any tutorial /guildelines or books. or simply where should i start . i have read the sio2 tutorial and code and some how get some general code ideas. but still lack the logic/knowledge to kickstart my project.

Thanks in advance!