Welcome to Android Central! Do you mean you wiped the Internal SD card? I assume you're rooted, correct? It's generally not a great idea to root your device and then not be entirely certain about what you're doing.
Is the OS intact? Are you able to boot up? If you can boot up, then log back in with your Google account, and if you installed all of your apps from Google Play, you can simply reinstall them. Any data that was synced with Google, or backed up somewhere else, should be easily recoverable. Anything that wasn't synced is gone.