Confession time. I’m busy, I’m behind, and I don’t know what to post. In looking for ideas, I found this Paul Graham article on his site during an Internet search. It is about writing essays, but the ideas apply to fiction. Here is the whole thing, in one long sentence. I’ve broken it up to ease reading of it.
As for how to write well, here's the short version: Write a bad version 1 as fast as you can; rewrite it over and over; cut
everything unnecessary; write in a conversational tone; develop a nose for bad
writing, so you can see and fix it in yours; imitate writers you like;
if you can't get started, tell someone what you plan to write about, then write down what you said; expect 80% of the ideas in an essay to happen after you start writing it, and 50% of those you start with to be wrong; be confident enough to cut; have friends you trust read your stuff and tell you which bits are confusing or drag; don't (always) make detailed outlines;
mull ideas over for a few days before writing; carry a small notebook or scrap paper with you; start writing when you think of the first sentence; if a deadline forces you to start before that, just say the most important sentence first; write about stuff you like; don't try to sound impressive; don't hesitate to change the topic on the fly; use footnotes to contain digressions; use anaphora to knit sentences together;
read your essays out loud to see (a) where you stumble over awkward phrases and (b) which bits are boring (the paragraphs you dread reading); try to tell the reader something new and useful; work in fairly big quanta of time;
when you restart, begin by rereading what you have so far; when you finish, leave yourself something easy to start with; accumulate notes for topics you plan to cover at the bottom of the file; don't feel obliged to cover any of them; write for a reader who won't read the essay as carefully as you do, just as pop songs are designed to sound ok on crappy car radios;