Coffee is a weird crop. 8000 trees is probably about 8 or 10 acres, and you're not going to be able to work that yourself.
Where you at? Hawaii?
Where you at? Hawaii?
One piece of advice I'll give you (I have a coffee farm in Puerto Rico) - you can make a lot more selling as an estate brand, i.e. retailing it yourself. From Madagascar, though, I have no idea how you'd do that internationally. But you have a couple of years to figure it out.
Arabica, dried properly and sorted well, should bring you at least $20 a pound retail, which is way more than you can approach wholesale. Even after labor, you can live on 8000 trees a year.