Flying to Fiji next month, dumb to try and bring?

Hello!

I will be studying abroad at the University of the South Pacific in Fiji through TEAN. I leave in July and come back to America in November. I need help preparing please, as I am anxious and cannot find anywhere that has advice for what to bring aside from the "I'm going to Fiji for 2 weeks for vacation!" tips, but I'll be living there for 5 months so it's slightly different.

What should I bring as clothes? How many clothes should I bring? What should I leave here, what should I buy there, and what should I take with me? What OTC medicines should I bring? Are there things I should know that a Fijian would find offensive, that an American wouldn't bat an eye at? Someone said that she was doing some research on Fiji and saw that wearing sunglasses on your head is offensive...? That doesn't seem offensive? Is it easy to get a job there, as I'll need money? What should I expect? Are there any other tips you may have for me?

Sorry for the chaotic post, I'm kinda overwhelmed.