Identity And Select Top x

in MSQ i have this stuff to play

Select Top "x" From Database, when "X" is the number of records i wan´t to get back from the DB.
How can i do something similar in Firebird ?

In SQL i can make a Stored Proc. like this.
Insert Into "Table"
(Name, Adress)
Values
("Diego","Wall Street")

Set @outpout_parameter = @@Identity

How can i get the Auto Id in Firebird ?

for top x you can use "select first 10 * from employee"
and for identity read about generators
http://www.firebirdsql.org/index.php?op=faq#q00111.dat