A few days ago, a newcomer vented in a meeting that he had no idea what to do with himself now that he wasn't drinking. Suggestions ....
1) Go to as many meetings as possible. When I first got sober, I went to three meetings a day. I got to know everyone, got to work making coffee and emptying ashtrays, and got comfortable with the whole process a lot more quickly than newcomers doing one meeting a day.
2) Get a job or keep your job. If you're not busy during the day, of course your mind will wander. Get a job, volunteer somewhere, or amp your performance at the job you have.
3) Clean house - literally. If you're sober, you have no excuse for living in a sty. Clean up after yourself around your home
4) Read the Big Book. If reading at home is too quiet and isolating, get thee to your nearest coffee shop or library and actually read the book everyone keeps raving about.
5) Serve your group. Does something need to be done at your meeting place? Then do it! Volunteer to wash the coffee mugs or clean the bathrooms. We are self-supporting through our own contributions, and that doesn't just mean money.