Multistage payload help

[j_fast_and_the_furious at hotmail.com (scotty to hotty)]

Hi, im new to metasploit but not to exploiting.... i have been using 
metasploit shellcodes for a week now and wanted some help on multistaged payloads
.Im not too sure on how i could add a multistage payload to my python 
scipt exploit.im exploiting a program witch i made. and i know my exploit is running 
perfectly since i used single stage payloads and they all execute as i want. is
there any sample exploit with a multistage payload i could find? 
preferably meterpreter or vnc. Anyways all i need to know is how to go about 
multistaging my exploits.
 
 Right now im quite fuzzy on the subject. does the first stage listen on 
a port and the second stage connects to that listening port and sends 
second stage witch then upgrades to meterpreter or vnc? or does the first 
stage open a listening port and the second stage is sent to the exploited 
programs port and is executed.
 
 Please clarify this for me. like i said some example code written in 
python would help.
 
P.S thnx for the help.
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