Kindle Book Cover Design

Information for the business: I'm the author
Industry: Education
Design details: Give me an estimated delivery date and cost for a Kindle Book Cover.

*Read the whole brief to ensure you include the mandatory answer to the question or your proposal will be rejected.*

Book Type/Genre - Education, Self-Help

It's a non-fiction 'self-help' type book for writers, but more of a manual than self-improvement.

Title, Sub Title and author details to be given on placing the job.

Some parameters:

I like a clean fresh modern look.
No cursive or curly fonts and definitely no Comic Sans or Times New Roman. Use appropriate web fonts. Choice of fonts is important because the design must be simple.
Clean strong colours.
Not too much detail, because the title, sub title and author's name must stand out, even in the Kindle library thumbnails.

Send me your ideas. Maybe some kind of vector pattern or shadowing would give the cover some depth.

Include the answer to the question in Extra Notes, in your proposal:
Target audience: Writers, mostly fiction writers and bloggers
Number of pages needed: n/a
Ideas for the visual style: Clean, fresh, modern, bright
Things to avoid: Cursive, curly fonts, Comic Sans, Times New Roman
Preferred colors: Keep black to a minimum. Use it for emphasis if you like.
Where the design will be used: Amazon Kindle Store
Extra notes: You must provide the format for Kindle, ratio 1:6. A minimum pixel size of 2500 on the long side, for best quality, and scale the short side appropriately.

Supply a png or jpeg file.

Leave a margin (or bleed) around the design because sometimes the KDP process chops it.

It's important you provide a delivery date and stick to it.

Answer this question in your proposal: How many beans make five?