If you want an actual number, you won't get one, because the actual question you're asking is how much is my time worth? and nobody here knows you well enough to make that assessment.

Maybe you don't mind slaving away for months for $500. Maybe that type of job is worth $5000 for you, if the client can afford it, especially if they'll profit off of it. Or maybe you want an hourly rate. It really depends on you and what works well for you.

I've given people basic sites for free before. I've charged clients thousands of dollars and still felt like I got ripped off. I think the right number is what the client is willing to pay for you to get it done.