Having problem with error codes on my website stats

Hello Everyone,

Harvey here. I started up a website just last week (www.bilques.com) and believe it or not but when you enter the name 'bilques' in Google it actually shows up!! Thats a good thing. However, when I check my stats I have about 5 or 6 errors that I have no clue about them. One of the errors that I am getting is an error 404. Which I just read about in another forum. So I created a robots.txt file for that. And I hope that was the problem but I am not sure as yet. Not until the next run of robots. And the rest of the errors well, I was hoping that someone could explain each one of the errors to me and give me a solution for solving them. It would be greatly appreciated. The errors are as follows:

HTTP Error codes
HTTP Error codes*____________ Hits_________ Percent________ Bandwidth
404 Document Not Found______ 74___________ 38.3 %_________ 0
302 Moved temporarily (redirect) 67___________ 34.7 %_______ 19.04 KB
401 Unauthorized _____________21___________ 10.8 %_______ 105 Bytes
206 Partial Content ___________19____________ 9.8 %________ 277.67 KB
301 Moved permanently (redirect)_10____________ 5.1 %_______ 3.12 KB
405 Method not allowed _________2_____________ 1 %_________ 646 Bytes