Prepping for pre-med?

After years of sitting on my hands too fearful to start down a path I didn't think I could finish, I'm finally taking the first of my pre-med requirements next semester - Bio 1!

I'm extremely rusty and anxious to begin, so any recommendations on prepping for it? I'm thinking about getting a head start by watching those online lectures by Khan Academy and Academic Earth.. Good idea or waste of time?

Thanks in advance!