We put a task list in place. So if you want to help out but don't know where to start, take a look at the task list. There are tasks for non-programmers as well so even if you have never written a line of code in your life, you can help out and become a Drupal contributor. Of course, you can also check the bugs reports, find a bug, fix it, and send a patch to the mailing list. Any help is most welcome. If, after checking the tasks and bug reports, you still want to help but don't know how or where to start, just post a comment below.