problem in Half life mods using sdk 2007 (in this month's digit dvds)

In this months digit dvd's there was half life mods to play.I did as directed but couldnot start the game...
What i did -
downloaded steam.Clicked on back and restore and selected the disk 1 in the sdk 2007 folder and it was installed.
Then i clicked on play and the game started.
But in the main menu there is no option to play.
There are only 3 things-1)Qiut 2)Options 3) don't know the exact name but it's for checking the frame rate.

Please help