Network Connection Question

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Hello All   I am a recent convert to Debian.   I have installed Debian in my old computer i386 machine (Configuration given below) I would like to know if there is a way I can have this macine to identlify the network and the ip address.   I have DSL Internet connection - I have a DSL Modem and a 4 port Linksys Router.  I have 2 computer connecting to this Router - One running Windows XP and the other Debian.   My question is 1.   How to have it identify the Network connection? 2.   Can I have it work as a firewall and a router - the DSL Modem connecting directly to the server.?   I have a mouse which connects to the USB Port - but its also not being identified by the X Window.     What commands I need to execute?   Need some help.   Thanks & Regards,   AARON ROY   ORIGINAL Configuration:   Intel® Celeron™ 366MHz (w/128KB Cache) PPGA CPU 32MB SyncDRAM (up to 256 MB) 2 USB Ports (1 is on Front) 1 Serial / 1 Parallel / 3 Expansion Slot Audio In & Out / Game Port on Front Internet Ready Microsoft Works ATI Rage Pro Turbo 2X AGP with 4MB SGRAM Crystal CS4280 3D PCI Audio 40x Max. CD-ROM Drive 4.3GB HDD (Ultra DMA EIDE)   [ADDED 30 GB NEW HDD] 3.5" 1.44MB FDD 56K* ITU V.90 PCI Fax/Modem PS/2 Keyboard/Mouse Stereo Speakers