You need to keep your project backers in the loop as you move forward with your campaign.  If you don't share regular updates with them, you could lose their interest and you may not be able to attract as many pledgers as you would like.
Fortunately, crowdfunding platforms generally have built-in tools that allow you to update your project backers and send messages out to them. Take advantage of these tools and keep everyone in the loop.
Hype is unnecessary. Be honest and regular with your updates. If things aren't going exactly as you hoped they would, be transparent.  Backers want to know that you can actually deliver on your project and the rewards that you promised them.