Most blog platforms come with some basic blog designs. They may call them templates or themes or something similar, and usually they are not bad although some customization is pretty common. I often see some common mistakes, and hopefully you will be able to avoid them after this discussion.
1) Include an “about me” page or at very least have information about you in your sidebar. Make it prominent and make it truly about you, not some resume-like page.
If people find your blog and like what you have to say, they’re going to want to know something about you.
2) Have contact information easily visible: an email or maybe even a phone number. Your email can be displayed as a graphic to prevent spammers from harvesting it easily. You can always use a different address than your main address if you like. You could use a throw away address such as a yahoo or a hotmail address.
Visible contact information will make you seem more real and although people may occasionally contact you, it will be far less often than you might think.