It does not have to be super detailed, but a budget will show potential backers that you've done your homework. Because Kickstarter uses an all-or-nothing funding model your funding goal should be the minimum amount necessary to execute your project. Do not go too low, however – remember, you are responsible for delivering rewards to your backers if your campaign is successful.
“Presumably, you’ll use some of the money raised on Kickstarter to make that happen. Plan and budget accordingly for these costs”. In addition, Kickstarter suggests you leave a monetary cushion to pay, well, Kickstarter. The crowdfunding platform applies a 5 percent fee to the total funds raised on successful campaigns, and there are additional credit card processing fees and tax fees.
You can read more here: https://www.entrepreneur.com/article/234707
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath