Honestly... there isn't really any one way that works for everyone. This is why roleplaying is so universal. This is also why we have different genres and levels of expertise. To say "don't do this"... well, it just doesn't really work when the idea of roleplaying is to find what works for you...
I agree wholeheartedly on everything, except the lying. Lying is never necessary, so long as tact is employed... If the writing quality isn't what you expected, say so... politely. But say so. Sometimes people misrepresent themselves, either intentionally or not, and they need to understand when...
Tutorial: How to Write a Collaborative Post
A helpful guide on the mechanics of writing a cooperative post or, conversely, how to avoid one liners, the 'dialogue' trap or violently murdering a group RP with unintentional 1x1s.
Who can write a collab?
Anyone and everyone...
Ugh. Can I just second the "be active" suggestion ;_; Nothing breaks my heart more as a GM then investing time and energy into something I created, then having people apply, respond once or twice and then never look at it again. Figuratively speaking, these thoughts and concepts are my babies...