My iphone 6s was recently stolen

I was wondering if I delete all my photos and text messages on icloud from my laptop will it be deleted from the device?

Yes. Because the both are connected in one account in icloud.

It should. But if you have access to iCloud then you should be able to at least put the phone on Lost Mode or Lock Mode & even track it.

No.

But check Find My iPhone from any computer or smartphone and you can wipe the phone remotely, but only as long as you weren't silly enough to have not activated Find My iPhone as prompted when you initially set up your iPhone.

Your data is pretty safe anyway: all data is encrypted by default and can only be accessed using your iPhone security code or fingerprint, so even if someone uses data recovery software all they can get is encrypted meaningless data. The sole exception is if it was stolen whilst you were using the phone: as long as the thief doesn't allow the phone to go into sleep mode then it's possible to access and forward individual photos to other devices. All you can fo to stop that, IF you didn't activate Find My iPhone, is to phone your service provider to instruct them to disable the SIM or to block the phone by permanently blacklisting the IMEI.