remote login Trojan, Trying to make a program that will select remote login. Options

[lokin]

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- Spratt_

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So the deal is I'm trying to write a script that will locate preferences--->sharing--->and then select remote login if there is write privileges.
This will be my first attempt at making something that does this so please give me a break.
what language should I use? perl?
what compiler? Xcode?
The program also has to run in the background or imbed it in a file or document of some kind.
Once again I have no experience here so please help all you can.
p.s. please don't write the code and say heres an example, I'll end up copying most of it.