I have apple care and was wondering how i went about getting a replacement phone?

if you have Apple Care with theft and loss..

AppleCare Products - iPhone - Apple

If you have AC+ or ACS the best option is to contact your carrier for device replacement options. If you have AC+ T&L, make sure find my is enabled and your phone has been placed in lost mode. That is the only way you'll be eligible for a theft and loss claim. If you have issues creating your claim contact Apple support.