Postgres now has all the information that it needs and has set up the files that it need in order to provide you with a DBMS. Now you need to start the database server by typing the following:
NOTE: if the PGDATA variable is not set you must specify the database directory with the -D option.
NOTE: -o specifies that you are sending arguements to the postmaster. -i is an arguement passed to the postmaster that allows you to connect to the database using java.