ODBC and JDBC setup

I had Mandrake 6.1 (from RedHat) installed Postgresql on my PC
automatically.  I have several newbie questions, if all these are provided
in the doc, please show me where.

1)  How do I test to see if it's installed correctly?
2)  Do I need to install ODBC and JDBC separately?  If so, how?
3)  Once I have installed the ODBC and JDBC on the Linux box, do I need to
install Samba in order for PCs with Windows 9x and NT to connect?

Thank you in advance for your kind assistance.

Long