US Immigration from Singapore

First off, I'm sorry if this is in the wrong section of the forum. I'm having a bit of a frustration with preparing for documents for the interview. Long story short, i am filipino by citizenship but grew up in Singapore since i was 3 and im a permenant resident here. Now, the thing is i am not sure if i also need police clearance from the philippines and a certificate of no marriage as singapore does not provide no marriages certificate (unless ive been looking at the wrong places). Also i understand that filipinos have to attend some sort of seminar which after they get a stamp on the passport before they fly to get married. Do i need to sit for that as well?