Term symbols: the bane of every p-chem student's existence. I remember leading TA sessions on the topic and by the time we were done - hours later - both the students and myself needed some serious quantities of beer.
I'd say the first thing to do is realize that a given electron configuration typically has more than one term symbol associated with it, because there are multiple electronic states that can have the same general electron configuration.
That realized, you need to write out every possible microstate for that electron configuration, THEN figure out the term symbol associated with that group of (identical) microstates. There is actually a pretty nice step-by-step guide available at wikipedia.http://en.wikipedia.org/wiki/Term_symbol
Check it out, see if you can't figure your problems out, then come back with additional questions.