need HELP with Sharp ir sensor and writing code

hey y'all i'm reviewing of message boards online still i'm totally clueless , don't know how begin whole process of writing code project:

using sharp ir sensor gradually increase pull of electromagnet object moves closer sensor.
can me begin process??

i know lot ask scratch none of getting through me.  

i'm guessing need use if() statement if object 80 cm sensor, electromagnet @ 0lb pull , object moves closer, electromagnets pull increase respectively.  

i'm sure of hardware setup far arduino, sharp, electromagnet, tip 120, resistors , power source concerned ... need understanding syntax of code.

thanks can give.

if know how if statements way.  you use nested if statements 'else if'
http://arduino.cc/en/reference/else

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