I don't know about you but I'm paying money whether through my own checking account, scholarship, grant, or loan to take classes.
I'll be damned if a professor doesn't give me my moneys worth, which effectively is hindering my understanding of the course and possibly affecting my grade.
Having said that, office hours.
Sometimes I got to another professor that I know with an understanding of the subject for help.
Wikipedia is a good start, LOL
Really, google.
MIT has open course documents, maybe your information can be found there.
TA's generally aren't helpful to me and I have had nothing but negative experiences from them.
I would tell my professor, look you're not responding, I need help. What gives?