Newbie needs help fine tuning sarge

[j Mak <joz_mak@yahoo.ca>]

Hi,

I've just installed sarge with much help from the
debian community. It works fine, now, and I am very
satisfied with it. But I have a few things still left
to fine tune. 
1  My /apt/sources.list is empty, where can i find
repository addresses.
2.Currntly, I can start synaptic only form the command
line but not from the menu, how can i fix this.
3.I connet to the internet using pon from the command
line, is there a   graphical interface for pon.

Thanks a lot
jozsefmak

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