You might have stayed up till midnight last night to kick off the month. (It's really sort of fun that you can finish off Halloween and start NaNo all at once).
Today is the first day in a marathon. Don't wear yourself out too fast! Get a solid start, put those words on the page, and don't forget to take care of yourself between writing sessions.
The rest of this week, focus on staying on track with your goals without wearing yourself out too quickly. I've burned myself early on in more Novembers than I can count. Personally, I shoot for about 2,000-2,500 words a day at this point in the game. It puts me ahead a little without wearing me out too much.
Here's to drinking coffee, getting sleep, and putting lots of words on the page.
When did you kick off NaNo? What's your writing goal for this week?