Help with creating Documentation

I have inherited a pgsql database and a raft of PHP programs. 

I am a "novice" as far as pgsql is concerned although as a mainframe dinosaur I have knowledge of a number of RDBS systems plus MS-SQL and MySQL .

The PHP code is quite readable but on the database side the previous owner did not believe in documentation! 

 

How can I generate a list of tables and then fields within the tables in pgsql?

 

I have looked in the documentation indexes but unable to see mention of such facilities?

 

Wej Parry

OST Ltd.  UK.