I've self published two books now ("Double Your Freelancing Rate" and "Sell Yourself Online: The Blueprint") Together they've netted me a little over $100k in revenue.

1) Don't write in a vacuum. Build an audience of people who want to buy (double points if you presell to them), and deliver value to them once a week in the form of takeaways from chapters you've just written, thoughts you have on the subject, etc.

2) "It's a comedy book" means you're likely selling to consumers, and it's pretty hard to explain the value (e.g. why someone should pay you for your book) when you're selling to a consumer.

3) Don't promote the book, promote blog posts that reinforce what you're writing that end with a call-to-action to join a mailing list.

4) I'd usually say setup multiple packages, but again, I'm not sure if that'd work for a consumer product.