Do not put “Welcome to our little website,” or any derivative of this on your website.
People know that it is your website. They just clicked or typed the url to get there. You can say “welcome” if you really feel the need, but the full message just really sounds hokey. It also gives the feeling of being really amateur. When I see this on a site, I automatically throw it in the mental wastebasket.
By the way, these “things not to do” are not necessarily meant to be massive paradigm-shift kind of things. I am not saying that if you don’t have that message on your website you will have a great online ministry. I am just saying not to do this.