Start with the basics -- The Negril 101 guide from the "old" board. http://www.negril.com/discus/messages/9472/51312.html
The Basics still apply, but remember other information about specific businesses might be a little dated, but mostly accurate.
Then read this board, or search the old board for threads that interest you.

And I'm sure everyone will chime in on their favorite drivers, restaurants and activities. The choices are endless.