What are the requirements to renew my permanent residence card (green card)?

My card expires on March 2010, how soon should I apply for it? is there going to be a questionnaire? should I be working while I apply for it?
Is there a site where I can get some professional advice?
Please help I am am really concerned

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what are the rules and regulations to renew your green card?

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whats the cost to renew a green card this year 2010?

I'm trying to find out how much does it cost
to renew a green card the accurte cost for it,
and also do you need to pay by credit card,money
order,or cash?

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