As for post length, I tend to hit between 300-600 words. I don't mind at all if you write more or less than that! Just give me enough to work with in a reply and we'll get along great.
With thread content, I'm happiest when we've got a general idea to work with. I'm not one for planning a thread step by step, but something prompting the thread is great. My weakest area is random meetup threads, where two characters are thrown together with nothing to do but talk. Sometimes I'll make them happen anyway because I really want to interact with someone but I'll be honest, I may end up floundering a little.
Feel free to reach out to me for plots in whatever manner you're most comfortable with! I like discord best because it's quickest/easier for me, but I can work with whatever.
Check out my characters below!