How can I make sure the colors that appear on my monitor look the same on the finished product?

Answer:

One good way to make sure your files look the way you want, is to request a match-print. A match print is a printed replica of your digital file. In most cases your probably not going to get an exact match from what you see on your computer due to monitor variations. A match print allows you to see all the colors, fonts, and layout of your product before anything is done. Most printers do not guarantee exact color matching.