Here’s a great post about what NaNoWriMo is great for, and what it is not. It will help you create a first draft and get down unexpected ideas. A draft like that will need many revisions. Leave your finished work alone for a while at the end of the month. Then go back and start the work of reshaping, adding, and cutting that will make your story work.
Do your research. Be aware. Before paying someone to publish your book or before signing a self-publishing contract, even if it does not involve an initial payment from you, Google the publisher’s name along with the word “scam.” Then, repeat with the word “complaint.” Read carefully and think.
Before you try to use meter and rhyme in a book for children, read this post from Tara Lazar. (Yes, you can do it, but…)
Here’s a warning that free services are not really free. You are paying for publicity, publication, storage, and more when you contribute anything online. Considering that these perks have real value, it is still worthwhile to post content of all sorts, but you should be aware that any of these sites can change their terms of service at any time. Be careful when posting recognizable photos of anyone, anywhere and think twice before using “free” cloud storage or exchange sites for potentially valuable original text. They might be okay, but I prefer external drives.