@Masterkey - i think that's sort of inevitable; if you want to write fast, then you don't write good. if you want to write good, you don't write fast. things like nanowrimo are designed to mute your voice to make room for sheer word count. remember you can always go back with a fine toothed comb and edit things; something i usually suggest to just about everyone is to make a point form plan for anything you want to write, since it helps with chronology and helps you keep track with where you're at
@Lord_Dunconius - i feel that 100%. for dialogue, i usually say what a character is saying out loud so i can tell if it sounds authentic. and actions scenes like fights are always tricky, i try to avoid them for that reason; only thing i could think of suggesting would to try to describe it from an overall perspective rather than deeply? you generally want smaller word counts for things that are faster-paced, with more short sentences and short(er) words over longer sentences/words/word counts. action is sharp and fast-paced, and your word flow should reflect that
@ReiniDays - you can do it! writing is always a challenge, but it's the same as most other forms of creativity; practice makes… not exactly perfect, but you'll get there as you go. reading helps a lot, too; sometimes i find a way that someone describes something to be super perfect and i'll end up using that at some point in the future. making plans might help get you started.
@wwmoxie - ive suggested this to a couple others, but the best thing i think you can do is make an in-depth plan to set up your plot. it gives you both a direction and a destination, and helps you tie in actions/events in a chronological sequences that is logical when you glance over it so you don't lose yourself. as for character development, try focusing on introspective/descriptive writing, rather than narrative. limit dialogue and action, and focus entirely on instrospection and thought process. but limit your use of '(insert words here)', (name) thought. describing a thought process in a roundabout way is a really hard to learn skill but once you get it you'll find it's a breeze to slap in your writing at almost any time (i personally find introspective writing easier to create because it flows so much more nicely).
@Starfast - i generally make a rule for myself, when i find myself in a scenario heavily inundated with dialogue: 50 words of dialogue for every 250-300 words of description. it'll help you pace yourself out a bit more and forces you to focus on leading the narrative with description and action, rather than just words. it'll slow down your entire scene and will generally help with your flow. i also never leave dialogue alone without at least one sentence of description in there.