New newbie question!

Diogo said:
MOSFETS, I'd like to know almost everything about the use of these devices on PAs. As you know I live in Brazil witch is, unfortunlly an undeveloped country, and most of the people I know and work with have no idea of how to use it!

They're usually used as source followers in the output stage. As peranders says you can do a search (I found this one under "mosfet output stage") Most of the output stages are quite similar with differing front ends.