Hello, could anyone help me with telling me what is the proper Creative Commons license i can apply to my stock photos? Which would be the equivalent of the license the stock agencies sell the photos? Thank you.

Creative Commons are generally free licenses some of which allow redistribution and "re-mixing" of your work so applying them would not be the same as the royalty free or rights managed licenses from the agencies which are much more restrictive.

there are multiple CC licenses you can choose which grant or w/hold different rights

https://creativecommons.org/faq/

This gives you an overview of what Creative Commons options you have

https://creativecommons.org/licenses/

The agencies all use slightly different variations of licenses. When we set up our own Symbiostock sites a few years back, a number of us made licenses that were to our liking, but which drew on common elements at many of the agencies.

You're welcome to review mine - just ways to make clear to buyers what they're buying and what they may not do

https://www.digitalbristles.com/License/standard-license-agreement/

https://www.digitalbristles.com/License/extended-license-agreement-2/