Hello! I'm also a teacher (2 years) going into nursing. I'm in the first semester of an accelerated program. I too have no medical background, and many people in my cohort do. Stay positive! You are all there to learn the same things.
I YouTube videos and use apps on my iPhone to help me. Some apps I use are: Taber's (contains videos), RN mentor, Stedman's Med Term, NCLEX, and there's a lot more.