Make sure you select the option to print at actual size in your printer settings. The wording may vary depending on which program you are using. It may be "Actual Size,", "No Scaling," or something else. This setting will allow you to print the name tags at their intended size.
Color differences between your monitor and the printout are normal. This is caused by a variety of things including monitor settings and the difference in how monitors display color (RGB) versus print (CMYK).
Print on heavy card stock for the best results. The name tags may also work with sticker paper, but we haven't tested it.