my phone was stolen but i had apple care ins what do i do

lock your device if you are able to and contact law enforcement.

https://support.apple.com/en-us/HT201472

If you had AppleCare+ with Theft & Loss see→File a claim if you have AppleCare+ with Theft and Loss coverage - Apple Support

Did you have just AppleCare + or did you have AppleCare + with Theft and Loss Coverage?

If you have the latter -> iPhone Theft and Loss Claims - Official Apple Support