A lot of it depends on where you are now (in terms of technique, eye and equipment) and on where you want to go? What kind of pictures do you want to take? Without knowing more about you, a few general suggestions (not in order of importance):
1) If you haven't already, get and learn to use some photo-editing software. For starters, learn how to adjust contrast, saturation, color balance and brightness. Then learn how to manipulate just parts of a photo.
2) Find a way to get feedback on your pictures (after your course is done). Take another course, join a photo club, find a website where people will offer critiques of photos.
3) Find photos that you like on the web (e.g. on photo.net, or flickr) and study them in detail. Could you take the same photo? What's good about it -- the composition, the background, the pose, the lighting, the colors? Look at some of your own photos equally carefully. What's good about them? What's bad or could be done better? (Somewhere in here you'll probably start wanting to upgrade your equipment, whatever it is, but that's another can of worms.)
4) Set yourself assignments: photograph an event, or a person, or a mood or a theme. There are websites that can help with this sort of thing, e.g. nikonians.org has a forum with monthly artistic assignments that people can try, and post their photos for others to comment on.
5) Pursue specific questions in more detail, depending on what you're interested in. There are plenty of books and websites out there on portrait lighting, for example, or nature photography or wedding photography. Do some studying.
Mostly, take a lot of pictures, think about what you're doing, and have fun.