I am really not techy at all... let's just pretend I am from the 19th century writing notes to give to the pony express. I have like maybe 30% of enough information to know that a blog is hosted on a website... so, is that where I build my blog?
If you are wanting to create an area that people can visit on the internet that houses blog posts that would be creating a website. You can see how to Create a Website Through Constant Contact here
If you are wanting to email out blog posts you would use our email templates. For example, if you want to send blog info or posts to you contact's email inbox instead of having them go to a website. You can see how to Create an Email here