We're having a bit of a terminology confusion, here, and I don't blame you because it can be confusing for a new user. I'll walk through the general terminology, and review some points.
Flagging is an anonymous act used by community users to either raise a post that needs improvement, raise it for moderator attention, or mark the post as spam or rude/abusive. The latter causes a small and temporary reputation penalty as if downvoted, unless 6 are accumulated in which the post is deleted and locked and you suffer a whopping -100. If it doesn't reach 6 votes within 2 days, the flags decay and you get your reputation back, so it's generally harmless.
The latter is posted in strict confidence to moderators only, so a flagged user technically shouldn't be alerted of the act unless the moderator needs to specifically talk to them.
None of your posts were flagged.
Closing makes a question unable to accept new answers. Comments may be posted and existing answers may be retooled. Only questions may be closed.
Closing by the community occurs when 5 users of sufficient reputation (usually 3k) vote to do so. A close vote decays after 4 days if the question doesn't accumulate 5. Closers select from a preset collection of reasons: duplicate, not-a-real-question, subjective and argumentative, off-topic, too localized, and belongs-on-meta. The last one actually migrates the question here. Duplicate votes will automatically generate a "possible duplicate of..." comment if the duplicate link is not already present, so that's automatic information of close intent.
Generally good etiquette for closing is that a user who votes for things besides duplicates will add a comment explaining why they voted. It's not necessary, but it traditionally helps, especially if the question can be retooled.
Additionally, when you hit 250 reputation, you gain the ability to vote to close and reopen your own posts. This has a side effect of allowing you to see current close votes on your questions. It may take some time to reach, but that offers the general functionality that you seem to be looking for.
If I'm missing any further inquiries from you, I'll be happy to address them.