OK, here are some sources:
https://steemit.com/steemcleaners/@steemcleaners/the-steemcleaners-guide-for-dealing-with-abuse-on-steemit
(this post has a link to a chat channel where you can discuss flag abuse)

https://steemit.com/steemit/@thecryptofiend/the-steemit-etiquette-guide-illustrated-by-klye
a basic etiquette guide to the site

https://steemit.com/steemit/@benjojo/what-the-flag-is-going-on
an example and discussion of a specific incident

I hope this helps