To request certified copies, you'll reach out to the county in which you were married (there will be reprinting and shipping fees).
Technically, you'll only need the original marriage certificate as no government agency will ever keep that certificate.
When you submit an application in the mail, the document will be returned when your new Photo ID (etc.) is shipped. If you submit in person, you'll leave with the certificate in hand.
With that being said, you can absolutely request Certified Copies if you don't feel comfortable putting your original certificate in the mail, or if you want to complete multiple steps simultaneously.
You should not need any more than two certified copies.