Planning is key. You will be most successful if you take the time to do proper planning at the beginning. Here are a few of my guidelines. Classroom time is just a small chunk of the total time you'll need to set aside. Expect to spend at least three times more for study, research, homework preparation.
Personal rhythms are important.
If you feel most energetic in the morning, try to arrange your schedule to study or attend classes early. If you're more creative at night, you might set aside time to study after the kids have gone to bed. If this isn't possible at home, consider using the college library. It may be less convenient, but you'll get more done. If your schedule doesn't allow you to travel more than 30 minutes each way, don't pick a school 45 minutes away.