This post has pretty much all the information in it, including the official NaNoWriMo Website (free to participate) with lots of information for writers and lots of encouragement.
Of course, you get lots of encouragement here as well. Many are using the daily prompt as their starting point for the days writing.
https://steemit.com/freewrite/@mariannewest/day-746-5-minute-freewrite-tuesday-prompt-trophy