Do you thank your backers the moment they back you? Or is that too spammy?
Personally, I do not; because if my campaign is very successful and I get a lot of backers, I'm going to be spending so much time sending individual thank you notes that I won't have any time left to manage other aspects of the campaign, much less work on the project that I'm supposed to complete. Instead, whenever there is occasion for an update or I am answering a question from someone who has already backed me, I make sure to say "Thank you for your support!" In the latter case, I'm already communicating with them so it's not spammy or extra work to add my thanks, and in the former I'm theoretically reaching everyone with just one message.
Help with shipping costs!
The method of shipping that you use should be determined by the size and weight of whatever it is you're shipping and how much packaging material you're going to need to give it a reasonable chance of arriving safely. The resulting cost is whatever it is. If it's too small to fit comfortably in a Priority Mail Small Flat Rate Box, don't try to force it just so you can keep the cost of postage down. Your backers are just going to have to pay whatever is necessary to pay to cover your cost.That being said, keep in mind that USPS' Flat Rate Boxes are not always your best value. Depending on how much the package weighs and where it's going, USPS' weight-and-distance-based rate may well be cheaper. Don't buy into USPS' "If it fits it ships" line without question, because you may pay more than you need to pay. If you're shipping something that weighs less than 1 pound, no way no how should you use Priority Mail; use First Class Package instead.Also, if you're going to handle fulfillment yourself, look into services that will give you a discount from USPS' over-the-counter prices. PayPal has such a service (although it's hard to find); I also use a service called Shippo that offers pretty good rates.
Updates: Every day, once a week? Frequency? Recommendations?
The conventional wisdom seems to be that you should update frequently, but I once saw a campaign that posted meaningless stuff almost every day, clearly updating just for the sake of it. It looked pretty silly.I post updates as needed, to mark milestones (like funding, or limited quantity rewards selling out), maybe once or twice as the campaign draws to and end to thank backers and remind the lookers that there isn't much time left. If there are significant developments regarding the project itself, of course that's an update right there. Sometimes I post thoughts about the process of creating these particular projects to my blog; that's an update, too.
How much should I talk about myself in the "About Me" section?
I think it's helpful to look at it from the other side of the equation. From your profile, it looks like you haven't backed any projects yet. Have you tried window-shopping on Kickstarter and thinking about what you would want to know about a creator before you backed them?In a former life, I had a store on eBay, but I bought a lot before I seriously considered selling. I found that my experience as a buyer helped me a lot in writing item descriptions. I just remembered all the stuff that I wanted to know before I would buy from someone else.