Take things one step at a time. Don't be too worried about getting everything you need at once, it'll only cause a sense of overwhelming. It is good that you have already begun to shadow a dentist, keep it up! Take the required courses, and you want to do the best you can in each of those classes. Consider taking the other courses that are recommended. Get to know the teachers in those courses, in order to build your network and maybe even weasel out a letter of recommendation, you sneaky devil 😉. Too me, that should be a pretty strong start for a foundation of your academic portfolio. Next, destroy the DATs, Apply, Interview, and then get accepted. BADABING BADABOOM!