Desktop mode

[G1 <gvan.g1@gmail.com>]

Hi,
I downloaded two 4Gb Debian installation files and installed in my laptop.  When I start it, it directly goes to command-line mode, and doesn't go to desktop mode.
I'm new to linux, and I dont know what to do now.  Any information links or help in this regard is highly appreciated.

And sound is also not coming; where can I find drivers for my sound card?
My laptop is Dell inspiron.

thanks.
-- 
G1