I see that you use "se" or "sa se" to say this is/that is...what would "se sa" mean? or is that even proper creole?

Sentence: Se sa!
Literally:   It's that! 
Meaning:  That's it!, There it is!,  Yes!, It's correct!, etc...

Haitian Creole ↔ English Reference, Look up Haitian Creole and English Words