Hey @kengtong, I'm glad that my videos inspired you to get started on Steemit! Let's see if I can answer your questions...
Our rewards pool is accumulated every 7 days so posts cannot receive payouts after that 7-day period. If someone upvotes your post after 7 days then they are wasting their voting power.
Resteems actually don't play any factor in curation rewards. The only way you earn curation rewards is for upvotes, and that's assuming that you have some Steem Power in your account. This is part of the reason I created @minnowfund - to help fund new Steemians who are trying to get started here.