There are only so many hours in every day. If you do not manage your time, many of those hours will be wasted. They will slip away unnoticed and you will have lost them forever. You will be much happier if your spend those hours working toward your goals and having something to be proud of afterwards.
To manage time you must first notice how long things take. How long do you need to sleep each night? How long does it take you to get ready in the morning? How long does it take to drive to school and/or work? How long does it take to prepare and eat meals? What other obligations do your have?
Once you have listed the obligations you already have -- taking care of yourself, children, spouse, etc. -- then you can calculate how much time you have left to commit to working toward your goals.
One way to approach this planning of time is to divide a sheet of paper into the days of the week, and the hours in every day. Then write in what has to happen each day. The gaps are what you have available for planning.
If you are planning to take college courses, remember that you will need to set aside several hours of study time for every hour that you spend in class. For instance, if you enroll for one 3-hour course, you should plan on at least nine hours of study time every week. This sort of planning can help you succeed, and keep you from overcommitting yourself and ending up frustrated or disappointed.
Try it right now. Divide up a sheet of paper and plan each of the days in your week. You may be surprised at the results. You may find some exciting opportunities. Good luck.