Q: fiance visa

My fiance in Colombia has been approved the visa, and we're now waiting for NVC to send us the letter about the appointment in the Colombian embassy. My question is about after he comes to the US. We know we have 90 days to get married, so we plan to do so 30 to 60 days after he's in the US. My question is, how can he work in the US in the meantime? If he applies for a work permit, I understand it takes about 90 days to get the permit, so would it be better to just wait until we get married and just file for it at the time we apply for a green card, all at once? My question is more related to the expense. Meaning, if we apply as soon as he comes in, will we have to pay AGAIN to apply once we get married, or how does that work?

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