One suggestion I have is to write a bit every day. Set a goal for yourself - either a word goal (500 words) or a time goal (half an hour) and try to hit it. To complete NaNoWriMo, a writer needs to average 1,667 words per day.
And if you get stuck, throw in so e random, oddball occurrence and decide how your characters will react in that situation. One of my favorites is "and then ninjas attacked!" If you don't like how that turns out, then you can clean it up or if it entirely when you edit it.
Oh! Editing! DON'T DO IT! It will be a strong temptation to go back and edit what you've written before. Resist that temptation! Keep plowing forward until you get to "The End." Once your first draft is complete, then you can start the editing process. If you start editing before you finish the first draft, you may never finish the first draft! So resist the temptation to do major editing or rewrites.
Those are the biggest tips I have. Let us know how it goes!
"All the miseries and evils which men suffer from vice, crime, ambition, injustice, oppression, slavery, and war, proceed from their despising or neglecting the precepts contained in the Bible." -- Noah Webster
My blog: Writing from Idaho