If you aren’t sure whether or not getting a degree online is something you can do, the best thing to do is try out a class. Start with something simple; maybe a prerequisite that you would need before taking some of the higher level course. You can get a feel for how the classes are set up, what is expected of you, and how much time it is going to require.
Most online schools begin the process with you applying to the school. Go through the process and find out what documents you need to submit and find out if you need to send in any transcripts. Then, browse through the list of classes and find something that has to do with your field of study. Go through the sign up process and get all of the important details you will need like the name of the required textbooks and assignment due dates.
When the class starts, read through the syllabus. Most will tell you how the class is set up and give you a guideline for getting in assignments, class projects (if applicable), and the final exam. You can begin to pace yourself to make sure that you can keep up with the work or begin to work ahead if you feel comfortable.
Some classes will require that you have tests and quizzes proctored by a local school or some other professional place. Find out what you need to do to get the materials sent there and how long it will take. If most classes require that you do this, it might be a good idea to keep all the information on hand for next time.