fanfiction.net, no matter how much lemon it has, is always a viable option for your plagiaristic needs.
archivesofourown.org is a heaping sack of shit, but it exists for a few sick reasons.
Any writer's group on reddit / facebook / tumblr will be more than happy to help.
Linear writing in general has always been a scatter-brained start because of how many sites exist to fill a certain niche. After you get tired of the bullshit responses from ELD immigrants and snarky geeks, you usually pick up some "Elements of Style" and self-proofreading shit and come to a proper editor to make adjustments.
Seriously, writing linear fiction is a lot of fucking trouble.