If this is a premium service you can probabaly charge as much as you can. If you don't want to loose him as a client think about his needs and what he can afford. But also consider how much time it will take you to organise these things and how much you need to be paid to be sustainable. I have linked a forbes article on how to price for consulting services.

Or divide the $300 fee you received by the number of hours worked to indicate how he might be "valuing" your time.

Thank you all for the help! I have a price I've decided on. :)

I would call a marketing firm in your area and ask for a quote on what they would charge for your same circumstances.

I was hired as a marketing consultant for an author who is self publishing. I wrote him up a package and he has paid me $300. He also wants me to handle scheduling book signings and setting up for book signings, but because that's not included in the package price, he wants me to give him an hourly rate for it. I'm not sure how much to charge. Any suggestions?

Also, I need to know rather quickly. Thank you! I appreciate it! :)