The Judge has it right with her comment on your Rule 7 (
I read each of my Chrons' posts at least three times to catch errors and ensure what I've written is clear). Treat each post that you make on the forum as a miniature story or essay and the continual practice will help your other writing no end. Your three posts so far in this thread are good examples - there's at least 15 grammar, spelling and punctuation errors between them.
Your points on
apostrophes and
their/there are, frankly, not something that I would include in a list of key rules - if you've problems with them, get a basic grammar book and apply it to what you write.
I won't go into your first two points, because I
personally think they are pernicious rubbish made fashionable by the creative writing police. It's like "
write what you know", which you'll often find given as advice for authors, and would bring all of science fiction and fantasy writing to a crashing halt if applied.
Here's a link to a post in WriteWords that you may find helpful:
What advice would you give to a new writer starting out?