my iMac was stolen and i'm trying to get the files that are on it back. help!?

Did you have any data on it synced with iCloud? If you aren't sure, you can use any internet browser and log into www.icloud.com and see what is there. If there is data there, you can download it and/or you can sync it with a replacement Mac or other device. For example, Access and manage your files in iCloud Drive - Apple Support and Set up and use iCloud Photos - Apple Support

If there is no iCloud data, did you make a backup to an external device (or to some other cloud service)? That would be your other option.

You can also restore from your Time Machine backup. You were backing up weren't you??