Register for your chosen course. If you want a general overview of the topic of biochemistry, you can take a basic course offered by a university as an open coursework class. These courses offer basic information on biochemistry, such as a definition of biochemical terms and methods, so you can decide if you wish to study it in more depth, but it does not count toward a degree. You can also register as a student at an online university and declare a biochemistry major. If you choose this path, you will want to make certain the online university you choose is approved by the American Chemical Society.
Purchase or rent the textbooks and supplies required for your chosen course. Textbook prices vary widely, depending on the publisher and type of course, but they may be available at your local library. Online courses may require you to perform chemistry experiments, and each university will have a system in place for this. Some require you to purchase the ingredients/materials yourself and experiment in your home, and some universities require you to use a lab on the university's campus or at an affiliate university nearby. Some programs allow you to use online software to simulate the experiment process. You should ask which option your program uses before you apply because it may effect your program choice.
Log on to check the weekly lessons and assignments for your course. Depending on the level of your course, the topics may be about the structure of proteins or the biochemical processes of the nervous system. Some online courses include a written "lecture" element that supplements any reading that is required before doing assignments. You may have a class message board and be required to participate in discussions with your teacher and classmates by posting replies to their questions and comments. The expectations in this regard should be laid out on the course homepage or in an initial post from your teacher.
Complete all assignments on time and submit them for review. Study for your tests, if required for your chosen course, and submit them on time as well. It is important for learning that you participate fully and communicate with your teachers, so they can evaluate what you have learned and fill in any gaps in your knowledge of the subject.