Question: I’m having some trouble with the ng and sa markers.

Bahay ni Mark = Mark's house
Bahay nina Mark at Pam = Mark and Pam's house
Para sa iyo = for you
Para kay Mark = for Mark
Para kina Mark at Pam = for Mark and Pam
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I am new to the language.

All four of those are name markers, with Nina and Kina being the plural forms of Ni and Kay, respectively. Ni and Nina are part of the Ng set of pronouns, which is used for object focus verbs and also for possession. Because they are the possessive forms of name markers, they tell you who things belong to (seen in AMBoy's post). Kay and Kina are the same words in the Sa set of pronouns, which are used in location focus scenarios, or to say who something is happening to or for (also in previous post). I hope that makes sense (and that I'm remembering terms correctly!) 😊