USB Drive doesn't detect

Ok, So I purchased a Macbook Pro that doesn't have an optical drive in it because the guy I purchased it from didn't describe until I checked my apple warranty and they told me to buy the superdrive, well I did that, and it is not recognizing the system and I called up Apple Care and now they are telling me to buy a third party usb drive to run my cd's and dvd's, I purchased the Macbook Pro last summer on Ebay and I just want to know if there is an Optical drive that is combatiable with the Macbook Pro with an Optical already installed on it?