Restore the iOS is to put the iOS in a brand new state, as if you just open it from it box for the first time.
Since you didn't perform the backup of your iPad, you are going to start from scratch again. But iTunes use to perform an auto backup each time you connect the device to your computer and open up iTunes, if you have not turn off auto backup, and you frequently use to connect your device to iTunes, then chances are that there will be a backup of your device in iTunes.
Now connect your device and perform the restore, let it finish the restore till you see iTunes asking you to set the device as a new one or to restore a backup (if there are backups within iTunes of course) then chose your most recent backup and restore the backup into your device. Good luck
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