Host / client application in vb.net

Hi there, i'm kinda new to vb.net, just migrated from 6.0.

I've gained interest on internet applications, i used to play with LAN stuff in 6.0 but never worked over the internet. So i'm trying to make a chat that works over the internet, my only problem is that i have no clue on where to start, so i was looking for some advice on this :).

edit: I currently have vb.net 2003 and frameworks 1.5, no sure if i need to get a more recent version.

perhaps a trip to msdn is in order?

VB.NET 2003
Asynchronous Server Socket Example
Asynchronous Client Socket Example

http://www.geocities.com/mohdabbas110/csp.html

and u can get some basic examples